21722476212 has 48 divisors (see below), whose sum is σ = 56479926720. Its totient is φ = 7219946016.

The previous prime is 21722476211. The next prime is 21722476229. The reversal of 21722476212 is 21267422712.

21722476212 is a `hidden beast` number, since 2 + 1 + 7 + 2 + 24 + 7 + 621 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21722476211) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 252343 + ... + 327294.

It is an arithmetic number, because the mean of its divisors is an integer number (1176665140).

Almost surely, 2^21722476212 is an apocalyptic number.

It is an amenable number.

21722476212 is an abundant number, since it is smaller than the sum of its proper divisors (34757450508).

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

21722476212 is a wasteful number, since it uses less digits than its factorization.

21722476212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579997 (or 579989 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

Adding to 21722476212 its reverse (21267422712), we get a palindrome (42989898924).

The spelling of 21722476212 in words is "twenty-one billion, seven hundred twenty-two million, four hundred seventy-six thousand, two hundred twelve".