21222720231 has 8 divisors (see below), whose sum is σ = 29272717680. Its totient is φ = 13660601472.

The previous prime is 21222720163. The next prime is 21222720251. The reversal of 21222720231 is 13202722212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21222720231 - 2¹¹ = 21222718183 is a prime.

It is a super-2 number, since 2×21222720231² (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 (21222720251) 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, 121969570 + ... + 121969743.

It is an arithmetic number, because the mean of its divisors is an integer number (3659089710).

Almost surely, 2^21222720231 is an apocalyptic number.

21222720231 is a deficient number, since it is larger than the sum of its proper divisors (8049997449).

21222720231 is a wasteful number, since it uses less digits than its factorization.

21222720231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243939345.

The product of its (nonzero) digits is 1344, while the sum is 24.

The spelling of 21222720231 in words is "twenty-one billion, two hundred twenty-two million, seven hundred twenty thousand, two hundred thirty-one".