21225252212 has 24 divisors (see below), whose sum is σ = 37721648160. Its totient is φ = 10448813600.

The previous prime is 21225252211. The next prime is 21225252253.

21225252212 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21225252212² (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 (21225252211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74438 + ... + 219069.

It is an arithmetic number, because the mean of its divisors is an integer number (1571735340).

Almost surely, 2^21225252212 is an apocalyptic number.

It is an amenable number.

21225252212 is a deficient number, since it is larger than the sum of its proper divisors (16496395948).

21225252212 is a wasteful number, since it uses less digits than its factorization.

21225252212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293791 (or 293789 counting only the distinct ones).

The product of its digits is 3200, while the sum is 26.

The spelling of 21225252212 in words is "twenty-one billion, two hundred twenty-five million, two hundred fifty-two thousand, two hundred twelve".