21210120213 has 8 divisors (see below), whose sum is σ = 28287395808. Its totient is φ = 14136462384.

The previous prime is 21210120209. The next prime is 21210120257. The reversal of 21210120213 is 31202101212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21210120213 - 2² = 21210120209 is a prime.

It is a super-2 number, since 2×21210120213² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21210120192 and 21210120201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210120293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 890731 + ... + 914232.

It is an arithmetic number, because the mean of its divisors is an integer number (3535924476).

Almost surely, 2^21210120213 is an apocalyptic number.

It is an amenable number.

21210120213 is a deficient number, since it is larger than the sum of its proper divisors (7077275595).

21210120213 is a wasteful number, since it uses less digits than its factorization.

21210120213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1808883.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21210120213 its reverse (31202101212), we get a palindrome (52412221425).

The spelling of 21210120213 in words is "twenty-one billion, two hundred ten million, one hundred twenty thousand, two hundred thirteen".