21021023310012 has 108 divisors (see below), whose sum is σ = 58431122597848. Its totient is φ = 6367289860800.

The previous prime is 21021023309971. The next prime is 21021023310019. The reversal of 21021023310012 is 21001332012012.

21021023310012 is a `hidden beast` number, since 210 + 210 + 233 + 1 + 0 + 0 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021023310019) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9195462 + ... + 11251602.

Almost surely, 2^{21021023310012} is an apocalyptic number.

21021023310012 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 21021023310012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29215561298924).

21021023310012 is an abundant number, since it is smaller than the sum of its proper divisors (37410099287836).

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

21021023310012 is a wasteful number, since it uses less digits than its factorization.

21021023310012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2058520 (or 2058504 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21021023310012 its reverse (21001332012012), we get a palindrome (42022355322024).

The spelling of 21021023310012 in words is "twenty-one trillion, twenty-one billion, twenty-three million, three hundred ten thousand, twelve".