21221102100210 has 32 divisors (see below), whose sum is σ = 51628325114880. Its totient is φ = 5581440551808.

The previous prime is 21221102100157. The next prime is 21221102100239. The reversal of 21221102100210 is 1200120112212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21221102100210.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4844998290 + ... + 4845002669.

It is an arithmetic number, because the mean of its divisors is an integer number (1613385159840).

Almost surely, 2^{21221102100210} is an apocalyptic number.

21221102100210 is an abundant number, since it is smaller than the sum of its proper divisors (30407223014670).

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

21221102100210 is a wasteful number, since it uses less digits than its factorization.

21221102100210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9690001042.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21221102100210 its reverse (1200120112212), we get a palindrome (22421222212422).

The spelling of 21221102100210 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred two million, one hundred thousand, two hundred ten".