21122002200420 has 72 divisors (see below), whose sum is σ = 69894625469760. Its totient is φ = 5120485381440.

The previous prime is 21122002200413. The next prime is 21122002200451. The reversal of 21122002200420 is 2400220022112.

21122002200420 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 20 + 0 + 220 + 0 + 420 = 666.

It is a super-2 number, since 2×21122002200420² (a number of 27 digits) contains 22 as substring.

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 = 21122002200393 and 21122002200402.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5333836960 + ... + 5333840919.

It is an arithmetic number, because the mean of its divisors is an integer number (970758687080).

Almost surely, 2^{21122002200420} is an apocalyptic number.

21122002200420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122002200420 is an abundant number, since it is smaller than the sum of its proper divisors (48772623269340).

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

21122002200420 is a wasteful number, since it uses less digits than its factorization.

21122002200420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10667677905 (or 10667677900 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21122002200420 its reverse (2400220022112), we get a palindrome (23522222222532).

The spelling of 21122002200420 in words is "twenty-one trillion, one hundred twenty-two billion, two million, two hundred thousand, four hundred twenty".