21010331221320 has 64 divisors (see below), whose sum is σ = 72035421333120. Its totient is φ = 4802361421824.

The previous prime is 21010331221301. The next prime is 21010331221349. The reversal of 21010331221320 is 2312213301012.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 12506148697 + ... + 12506150376.

It is an arithmetic number, because the mean of its divisors is an integer number (1125553458330).

Almost surely, 2^{21010331221320} is an apocalyptic number.

21010331221320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010331221320 is an abundant number, since it is smaller than the sum of its proper divisors (51025090111800).

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

21010331221320 is a wasteful number, since it uses less digits than its factorization.

21010331221320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25012299094 (or 25012299090 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21010331221320 its reverse (2312213301012), we get a palindrome (23322544522332).

The spelling of 21010331221320 in words is "twenty-one trillion, ten billion, three hundred thirty-one million, two hundred twenty-one thousand, three hundred twenty".