21999730272 has 48 divisors (see below), whose sum is σ = 62191548720. Its totient is φ = 6769147392.

The previous prime is 21999730231. The next prime is 21999730273. The reversal of 21999730272 is 27203799912.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21999730273) 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 7 ways as a sum of consecutive naturals, for example, 8812747 + ... + 8815242.

It is an arithmetic number, because the mean of its divisors is an integer number (1295657265).

Almost surely, 2^21999730272 is an apocalyptic number.

It is an amenable number.

21999730272 is an abundant number, since it is smaller than the sum of its proper divisors (40191818448).

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

21999730272 is a wasteful number, since it uses less digits than its factorization.

21999730272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17628015 (or 17628007 counting only the distinct ones).

The product of its (nonzero) digits is 857304, while the sum is 51.

The spelling of 21999730272 in words is "twenty-one billion, nine hundred ninety-nine million, seven hundred thirty thousand, two hundred seventy-two".