21311310100220 has 48 divisors (see below), whose sum is σ = 52529499503040. Its totient is φ = 7109255568384.

The previous prime is 21311310100219. The next prime is 21311310100303. The reversal of 21311310100220 is 2200101311312.

It is a congruent number.

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, 2057071085 + ... + 2057081444.

It is an arithmetic number, because the mean of its divisors is an integer number (1094364572980).

Almost surely, 2^{21311310100220} is an apocalyptic number.

21311310100220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21311310100220 is an abundant number, since it is smaller than the sum of its proper divisors (31218189402820).

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

21311310100220 is a wasteful number, since it uses less digits than its factorization.

21311310100220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4114152582 (or 4114152580 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21311310100220 its reverse (2200101311312), we get a palindrome (23511411411532).

The spelling of 21311310100220 in words is "twenty-one trillion, three hundred eleven billion, three hundred ten million, one hundred thousand, two hundred twenty".