21710254272 has 224 divisors, whose sum is σ = 66710917632. Its totient is φ = 6103351296.

The previous prime is 21710254229. The next prime is 21710254301. The reversal of 21710254272 is 27245201712.

It is a tau number, because it is divible by the number of its divisors (224).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24754698 + ... + 24755574.

Almost surely, 2^21710254272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21710254272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33355458816).

21710254272 is an abundant number, since it is smaller than the sum of its proper divisors (45000663360).

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

21710254272 is a wasteful number, since it uses less digits than its factorization.

21710254272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175 (or 1165 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 33.

Adding to 21710254272 its reverse (27245201712), we get a palindrome (48955455984).

The spelling of 21710254272 in words is "twenty-one billion, seven hundred ten million, two hundred fifty-four thousand, two hundred seventy-two".