21211010212320 has 72 divisors (see below), whose sum is σ = 72382572354456. Its totient is φ = 5656269389568.

The previous prime is 21211010212211. The next prime is 21211010212361. The reversal of 21211010212320 is 2321201011212.

21211010212320 is a `hidden beast` number, since 2 + 12 + 110 + 10 + 212 + 320 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21211010212293 and 21211010212302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7364932662 + ... + 7364935541.

It is an arithmetic number, because the mean of its divisors is an integer number (1005313504923).

Almost surely, 2^{21211010212320} is an apocalyptic number.

21211010212320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211010212320 is an abundant number, since it is smaller than the sum of its proper divisors (51171562142136).

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

21211010212320 is a wasteful number, since it uses less digits than its factorization.

21211010212320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14729868224 (or 14729868213 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21211010212320 its reverse (2321201011212), we get a palindrome (23532211223532).

The spelling of 21211010212320 in words is "twenty-one trillion, two hundred eleven billion, ten million, two hundred twelve thousand, three hundred twenty".