21020202112100 has 36 divisors (see below), whose sum is σ = 45614094862644. Its totient is φ = 8408033604480.

The previous prime is 21020202112099. The next prime is 21020202112121. The reversal of 21020202112100 is 121120202012.

It can be written as a sum of positive squares in 6 ways, for example, as 3163695427684 + 17856506684416 = 1778678^2 + 4225696^2 .

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, 21354374 + ... + 22317026.

It is an arithmetic number, because the mean of its divisors is an integer number (1267058190629).

Almost surely, 2^{21020202112100} is an apocalyptic number.

21020202112100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020202112100 is an abundant number, since it is smaller than the sum of its proper divisors (24593892750544).

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

21020202112100 is a wasteful number, since it uses less digits than its factorization.

21020202112100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181024 (or 1181017 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21020202112100 its reverse (121120202012), we get a palindrome (21141322314112).

The spelling of 21020202112100 in words is "twenty-one trillion, twenty billion, two hundred two million, one hundred twelve thousand, one hundred".