21021220302110 has 128 divisors (see below), whose sum is σ = 44859587235840. Its totient is φ = 6947628293760.

The previous prime is 21021220302031. The next prime is 21021220302161. The reversal of 21021220302110 is 1120302212012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1104568295 + ... + 1104587325.

It is an arithmetic number, because the mean of its divisors is an integer number (350465525280).

Almost surely, 2^{21021220302110} is an apocalyptic number.

21021220302110 is an abundant number, since it is smaller than the sum of its proper divisors (23838366933730).

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

21021220302110 is an equidigital number, since it uses as much as digits as its factorization.

21021220302110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19779 (or 19721 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21021220302110 its reverse (1120302212012), we get a palindrome (22141522514122).

The spelling of 21021220302110 in words is "twenty-one trillion, twenty-one billion, two hundred twenty million, three hundred two thousand, one hundred ten".