212221320140 has 24 divisors (see below), whose sum is σ = 449608713120. Its totient is φ = 84137301248.

The previous prime is 212221320127. The next prime is 212221320149. The reversal of 212221320140 is 41023122212.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (212221320149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46949360 + ... + 46953879.

It is an arithmetic number, because the mean of its divisors is an integer number (18733696380).

Almost surely, 2^212221320140 is an apocalyptic number.

212221320140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212221320140 is an abundant number, since it is smaller than the sum of its proper divisors (237387392980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212221320140 is a wasteful number, since it uses less digits than its factorization.

212221320140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93903361 (or 93903359 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 212221320140 its reverse (41023122212), we get a palindrome (253244442352).

The spelling of 212221320140 in words is "two hundred twelve billion, two hundred twenty-one million, three hundred twenty thousand, one hundred forty".