21122001147 has 16 divisors (see below), whose sum is σ = 31034355968. Its totient is φ = 12695870880.

The previous prime is 21122001139. The next prime is 21122001151. The reversal of 21122001147 is 74110022112.

It is not a de Polignac number, because 21122001147 - 2³ = 21122001139 is a prime.

It is a super-2 number, since 2×21122001147² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21122001347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6295879 + ... + 6299232.

It is an arithmetic number, because the mean of its divisors is an integer number (1939647248).

Almost surely, 2^21122001147 is an apocalyptic number.

21122001147 is a deficient number, since it is larger than the sum of its proper divisors (9912354821).

21122001147 is a wasteful number, since it uses less digits than its factorization.

21122001147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12595170.

The product of its (nonzero) digits is 224, while the sum is 21.

Adding to 21122001147 its reverse (74110022112), we get a palindrome (95232023259).

The spelling of 21122001147 in words is "twenty-one billion, one hundred twenty-two million, one thousand, one hundred forty-seven".