21021000002112 has 224 divisors, whose sum is σ = 61202956713984. Its totient is φ = 6314576486400.

The previous prime is 21021000002081. The next prime is 21021000002227. The reversal of 21021000002112 is 21120000012012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 328005912 + ... + 328069992.

Almost surely, 2^{21021000002112} is an apocalyptic number.

21021000002112 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 21021000002112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30601478356992).

21021000002112 is an abundant number, since it is smaller than the sum of its proper divisors (40181956711872).

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

21021000002112 is a wasteful number, since it uses less digits than its factorization.

21021000002112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65457 (or 65447 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21021000002112 its reverse (21120000012012), we get a palindrome (42141000014124).

The spelling of 21021000002112 in words is "twenty-one trillion, twenty-one billion, two thousand, one hundred twelve".