21012011232100 has 36 divisors (see below), whose sum is σ = 52109787857344. Its totient is φ = 7204118136480.

The previous prime is 21012011232097. The next prime is 21012011232103. The reversal of 21012011232100 is 123211021012.

It is an interprime number because it is at equal distance from previous prime (21012011232097) and next prime (21012011232103).

It is not an unprimeable number, because it can be changed into a prime (21012011232103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15008578752 + ... + 15008580151.

Almost surely, 2^{21012011232100} is an apocalyptic number.

21012011232100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012011232100 is an abundant number, since it is smaller than the sum of its proper divisors (31097776625244).

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

21012011232100 is a wasteful number, since it uses less digits than its factorization.

21012011232100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30017158924 (or 30017158917 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21012011232100 its reverse (123211021012), we get a palindrome (21135222253112).

The spelling of 21012011232100 in words is "twenty-one trillion, twelve billion, eleven million, two hundred thirty-two thousand, one hundred".