21012354412 has 24 divisors (see below), whose sum is σ = 42345515520. Its totient is φ = 8936550480.

The previous prime is 21012354397. The next prime is 21012354431. The reversal of 21012354412 is 21445321012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2860612 + ... + 2867947.

It is an arithmetic number, because the mean of its divisors is an integer number (1764396480).

Almost surely, 2^21012354412 is an apocalyptic number.

It is an amenable number.

21012354412 is an abundant number, since it is smaller than the sum of its proper divisors (21333161108).

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

21012354412 is a wasteful number, since it uses less digits than its factorization.

21012354412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5728701 (or 5728699 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21012354412 its reverse (21445321012), we get a palindrome (42457675424).

The spelling of 21012354412 in words is "twenty-one billion, twelve million, three hundred fifty-four thousand, four hundred twelve".