20215221512 has 16 divisors (see below), whose sum is σ = 38709999360. Its totient is φ = 9892555024.

The previous prime is 20215221497. The next prime is 20215221529. The reversal of 20215221512 is 21512251202.

It is a super-2 number, since 2×20215221512² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26881568 + ... + 26882319.

It is an arithmetic number, because the mean of its divisors is an integer number (2419374960).

Almost surely, 2^20215221512 is an apocalyptic number.

It is an amenable number.

20215221512 is a deficient number, since it is larger than the sum of its proper divisors (18494777848).

20215221512 is a wasteful number, since it uses less digits than its factorization.

20215221512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53763940 (or 53763936 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

Adding to 20215221512 its reverse (21512251202), we get a palindrome (41727472714).

The spelling of 20215221512 in words is "twenty billion, two hundred fifteen million, two hundred twenty-one thousand, five hundred twelve".