21132213207 has 32 divisors (see below), whose sum is σ = 33252618240. Its totient is φ = 11681660160.

The previous prime is 21132213199. The next prime is 21132213209. The reversal of 21132213207 is 70231223112.

It is a happy number.

It is not a de Polignac number, because 21132213207 - 2³ = 21132213199 is a prime.

It is a super-2 number, since 2×21132213207² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132213209) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2608419 + ... + 2616507.

It is an arithmetic number, because the mean of its divisors is an integer number (1039144320).

Almost surely, 2^21132213207 is an apocalyptic number.

21132213207 is a deficient number, since it is larger than the sum of its proper divisors (12120405033).

21132213207 is a wasteful number, since it uses less digits than its factorization.

21132213207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12143.

The product of its (nonzero) digits is 1008, while the sum is 24.

Adding to 21132213207 its reverse (70231223112), we get a palindrome (91363436319).

The spelling of 21132213207 in words is "twenty-one billion, one hundred thirty-two million, two hundred thirteen thousand, two hundred seven".