21945722230 has 16 divisors (see below), whose sum is σ = 39504638304. Its totient is φ = 8777769280.

The previous prime is 21945722221. The next prime is 21945722233. The reversal of 21945722230 is 3222754912.

It is a super-2 number, since 2×21945722230² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21945722230.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21945722233) 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, 144639 + ... + 254581.

It is an arithmetic number, because the mean of its divisors is an integer number (2469039894).

Almost surely, 2^21945722230 is an apocalyptic number.

21945722230 is a deficient number, since it is larger than the sum of its proper divisors (17558916074).

21945722230 is a wasteful number, since it uses less digits than its factorization.

21945722230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129911.

The product of its (nonzero) digits is 60480, while the sum is 37.

The spelling of 21945722230 in words is "twenty-one billion, nine hundred forty-five million, seven hundred twenty-two thousand, two hundred thirty".