21020122100100 has 36 divisors (see below), whose sum is σ = 60818219943824. Its totient is φ = 5605365893280.

The previous prime is 21020122100063. The next prime is 21020122100119. The reversal of 21020122100100 is 100122102012.

It is a super-2 number, since 2×21020122100100² (a number of 27 digits) contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 35033536534 + ... + 35033537133.

Almost surely, 2^{21020122100100} is an apocalyptic number.

21020122100100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020122100100 is an abundant number, since it is smaller than the sum of its proper divisors (39798097843724).

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

21020122100100 is a wasteful number, since it uses less digits than its factorization.

21020122100100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70067073684 (or 70067073677 counting only the distinct ones).

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

Adding to 21020122100100 its reverse (100122102012), we get a palindrome (21120244202112).

The spelling of 21020122100100 in words is "twenty-one trillion, twenty billion, one hundred twenty-two million, one hundred thousand, one hundred".