21010012020100 has 36 divisors (see below), whose sum is σ = 46651998792784. Its totient is φ = 8208562834080.

The previous prime is 21010012020077. The next prime is 21010012020157. The reversal of 21010012020100 is 102021001012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2443020354 + ... + 2443028953.

Almost surely, 2^{21010012020100} is an apocalyptic number.

21010012020100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010012020100 is an abundant number, since it is smaller than the sum of its proper divisors (25641986772684).

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

21010012020100 is a wasteful number, since it uses less digits than its factorization.

21010012020100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4886049364 (or 4886049357 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21010012020100 its reverse (102021001012), we get a palindrome (21112033021112).

The spelling of 21010012020100 in words is "twenty-one trillion, ten billion, twelve million, twenty thousand, one hundred".