21212202012100 has 144 divisors (see below), whose sum is σ = 52917132836736. Its totient is φ = 7305105280000.

The previous prime is 21212202012059. The next prime is 21212202012119. The reversal of 21212202012100 is 121020221212.

It is a happy number.

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, 1595329 + ... + 6705928.

It is an arithmetic number, because the mean of its divisors is an integer number (367480089144).

Almost surely, 2^{21212202012100} is an apocalyptic number.

21212202012100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212202012100 is an abundant number, since it is smaller than the sum of its proper divisors (31704930824636).

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

21212202012100 is a wasteful number, since it uses less digits than its factorization.

21212202012100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8301406 (or 8301399 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21212202012100 its reverse (121020221212), we get a palindrome (21333222233312).

The spelling of 21212202012100 in words is "twenty-one trillion, two hundred twelve billion, two hundred two million, twelve thousand, one hundred".