21210011021100 has 144 divisors (see below), whose sum is σ = 66949327218816. Its totient is φ = 5141604288000.

The previous prime is 21210011021099. The next prime is 21210011021113. The reversal of 21210011021100 is 112011001212.

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 47 ways as a sum of consecutive naturals, for example, 86657895 + ... + 86902305.

It is an arithmetic number, because the mean of its divisors is an integer number (464925883464).

Almost surely, 2^{21210011021100} is an apocalyptic number.

21210011021100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210011021100 is an abundant number, since it is smaller than the sum of its proper divisors (45739316197716).

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

21210011021100 is a wasteful number, since it uses less digits than its factorization.

21210011021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270736 (or 270729 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21210011021100 its reverse (112011001212), we get a palindrome (21322022022312).

The spelling of 21210011021100 in words is "twenty-one trillion, two hundred ten billion, eleven million, twenty-one thousand, one hundred".