21021923453230 has 64 divisors (see below), whose sum is σ = 44166317893632. Its totient is φ = 7053987951360.

The previous prime is 21021923453221. The next prime is 21021923453233. The reversal of 21021923453230 is 3235432912012.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21021923453230.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021923453233) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 239820210 + ... + 239907850.

It is an arithmetic number, because the mean of its divisors is an integer number (690098717088).

Almost surely, 2^{21021923453230} is an apocalyptic number.

21021923453230 is an abundant number, since it is smaller than the sum of its proper divisors (23144394440402).

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

21021923453230 is a wasteful number, since it uses less digits than its factorization.

21021923453230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160609.

The product of its (nonzero) digits is 77760, while the sum is 37.

The spelling of 21021923453230 in words is "twenty-one trillion, twenty-one billion, nine hundred twenty-three million, four hundred fifty-three thousand, two hundred thirty".