21122102320 has 40 divisors (see below), whose sum is σ = 53573334480. Its totient is φ = 7680764160.

The previous prime is 21122102317. The next prime is 21122102341. The reversal of 21122102320 is 2320122112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×21122102320² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 21122102294 and 21122102303.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12000315 + ... + 12002074.

It is an arithmetic number, because the mean of its divisors is an integer number (1339333362).

Almost surely, 2^21122102320 is an apocalyptic number.

21122102320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122102320 is an abundant number, since it is smaller than the sum of its proper divisors (32451232160).

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

21122102320 is a wasteful number, since it uses less digits than its factorization.

21122102320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24002413 (or 24002407 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21122102320 its reverse (2320122112), we get a palindrome (23442224432).

The spelling of 21122102320 in words is "twenty-one billion, one hundred twenty-two million, one hundred two thousand, three hundred twenty".