212040013 has 4 divisors (see below), whose sum is σ = 221259168. Its totient is φ = 202820860.

The previous prime is 212040001. The next prime is 212040043. The reversal of 212040013 is 310040212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212040013 is a prime.

It is a super-2 number, since 2×212040013² = 89921934226080338, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212039975 and 212040002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212040043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4609543 + ... + 4609588.

It is an arithmetic number, because the mean of its divisors is an integer number (55314792).

Almost surely, 2^212040013 is an apocalyptic number.

212040013 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

212040013 is a deficient number, since it is larger than the sum of its proper divisors (9219155).

212040013 is an equidigital number, since it uses as much as digits as its factorization.

212040013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9219154.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 212040013 is about 14561.5937657936. The cubic root of 212040013 is about 596.3107070613.

Adding to 212040013 its reverse (310040212), we get a palindrome (522080225).

The spelling of 212040013 in words is "two hundred twelve million, forty thousand, thirteen".