21021058212 has 384 divisors, whose sum is σ = 68279500800. Its totient is φ = 4967424000.

The previous prime is 21021058193. The next prime is 21021058271. The reversal of 21021058212 is 21285012012.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 23860012 + ... + 23860892.

It is an arithmetic number, because the mean of its divisors is an integer number (177811200).

Almost surely, 2^21021058212 is an apocalyptic number.

21021058212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21021058212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34139750400).

21021058212 is an abundant number, since it is smaller than the sum of its proper divisors (47258442588).

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

21021058212 is a wasteful number, since it uses less digits than its factorization.

21021058212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968 (or 952 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 24.

The spelling of 21021058212 in words is "twenty-one billion, twenty-one million, fifty-eight thousand, two hundred twelve".