21132022212 has 72 divisors (see below), whose sum is σ = 62082820800. Its totient is φ = 5935382208.

The previous prime is 21132022207. The next prime is 21132022213. The reversal of 21132022212 is 21222023112.

It is a super-2 number, since 2×21132022212² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21132022213) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 695787 + ... + 725522.

It is an arithmetic number, because the mean of its divisors is an integer number (862261400).

Almost surely, 2^21132022212 is an apocalyptic number.

It is an amenable number.

21132022212 is an abundant number, since it is smaller than the sum of its proper divisors (40950798588).

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

21132022212 is a wasteful number, since it uses less digits than its factorization.

21132022212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421385 (or 1421380 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21132022212 its reverse (21222023112), we get a palindrome (42354045324).

The spelling of 21132022212 in words is "twenty-one billion, one hundred thirty-two million, twenty-two thousand, two hundred twelve".