21235653212 has 12 divisors (see below), whose sum is σ = 37274668536. Its totient is φ = 10585747920.

The previous prime is 21235653193. The next prime is 21235653217.

21235653212 is nontrivially palindromic in base 10.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21235653217) 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, 8018183 + ... + 8020830.

It is an arithmetic number, because the mean of its divisors is an integer number (3106222378).

Almost surely, 2^21235653212 is an apocalyptic number.

It is an amenable number.

21235653212 is a deficient number, since it is larger than the sum of its proper divisors (16039015324).

21235653212 is a wasteful number, since it uses less digits than its factorization.

21235653212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16039348 (or 16039346 counting only the distinct ones).

The product of its digits is 21600, while the sum is 32.

The spelling of 21235653212 in words is "twenty-one billion, two hundred thirty-five million, six hundred fifty-three thousand, two hundred twelve".