21012210996 has 24 divisors (see below), whose sum is σ = 56032562880. Its totient is φ = 6003488832.

The previous prime is 21012210977. The next prime is 21012210997. The reversal of 21012210996 is 69901221012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012210997) 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, 125072601 + ... + 125072768.

It is an arithmetic number, because the mean of its divisors is an integer number (2334690120).

Almost surely, 2^21012210996 is an apocalyptic number.

It is an amenable number.

21012210996 is an abundant number, since it is smaller than the sum of its proper divisors (35020351884).

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

21012210996 is a wasteful number, since it uses less digits than its factorization.

21012210996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250145383 (or 250145381 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 33.

The spelling of 21012210996 in words is "twenty-one billion, twelve million, two hundred ten thousand, nine hundred ninety-six".