21190642212 has 24 divisors (see below), whose sum is σ = 50650804512. Its totient is φ = 6891265600.

The previous prime is 21190642211. The next prime is 21190642303. The reversal of 21190642212 is 21224609112.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21190642212.

It is not an unprimeable number, because it can be changed into a prime (21190642211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21534714 + ... + 21535697.

It is an arithmetic number, because the mean of its divisors is an integer number (2110450188).

Almost surely, 2^21190642212 is an apocalyptic number.

It is an amenable number.

21190642212 is an abundant number, since it is smaller than the sum of its proper divisors (29460162300).

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

21190642212 is a wasteful number, since it uses less digits than its factorization.

21190642212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43070459 (or 43070457 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The spelling of 21190642212 in words is "twenty-one billion, one hundred ninety million, six hundred forty-two thousand, two hundred twelve".