21320101331220 has 96 divisors (see below), whose sum is σ = 64175176396800. Its totient is φ = 5271532320384.

The previous prime is 21320101331197. The next prime is 21320101331237. The reversal of 21320101331220 is 2213310102312.

It is a super-2 number, since 2×21320101331220² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 198902200 + ... + 199009359.

It is an arithmetic number, because the mean of its divisors is an integer number (668491420800).

Almost surely, 2^{21320101331220} is an apocalyptic number.

21320101331220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21320101331220 is an abundant number, since it is smaller than the sum of its proper divisors (42855075065580).

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

21320101331220 is a wasteful number, since it uses less digits than its factorization.

21320101331220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397911637 (or 397911635 counting only the distinct ones).

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

Adding to 21320101331220 its reverse (2213310102312), we get a palindrome (23533411433532).

The spelling of 21320101331220 in words is "twenty-one trillion, three hundred twenty billion, one hundred one million, three hundred thirty-one thousand, two hundred twenty".