21072213226 has 16 divisors (see below), whose sum is σ = 33349138560. Its totient is φ = 9958407840.

The previous prime is 21072213193. The next prime is 21072213229. The reversal of 21072213226 is 62231227012.

It is a junction number, because it is equal to n+sod(n) for n = 21072213194 and 21072213203.

It is not an unprimeable number, because it can be changed into a prime (21072213229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 626931 + ... + 659686.

It is an arithmetic number, because the mean of its divisors is an integer number (2084321160).

Almost surely, 2^21072213226 is an apocalyptic number.

21072213226 is a deficient number, since it is larger than the sum of its proper divisors (12276925334).

21072213226 is a wasteful number, since it uses less digits than its factorization.

21072213226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1287069.

The product of its (nonzero) digits is 4032, while the sum is 28.

The spelling of 21072213226 in words is "twenty-one billion, seventy-two million, two hundred thirteen thousand, two hundred twenty-six".