21222040020 has 24 divisors (see below), whose sum is σ = 59421712224. Its totient is φ = 5659210656.

The previous prime is 21222040009. The next prime is 21222040031. The reversal of 21222040020 is 2004022212.

It is an interprime number because it is at equal distance from previous prime (21222040009) and next prime (21222040031).

It is a super-3 number, since 3×21222040020³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

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, 176850274 + ... + 176850393.

It is an arithmetic number, because the mean of its divisors is an integer number (2475904676).

Almost surely, 2^21222040020 is an apocalyptic number.

21222040020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222040020 is an abundant number, since it is smaller than the sum of its proper divisors (38199672204).

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

21222040020 is a wasteful number, since it uses less digits than its factorization.

21222040020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353700679 (or 353700677 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

Adding to 21222040020 its reverse (2004022212), we get a palindrome (23226062232).

The spelling of 21222040020 in words is "twenty-one billion, two hundred twenty-two million, forty thousand, twenty".