21770472 has 32 divisors (see below), whose sum is σ = 57628800. Its totient is φ = 6829824.

The previous prime is 21770471. The next prime is 21770479. The reversal of 21770472 is 27407712.

It is a super-2 number, since 2×21770472² = 947906902205568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21770471) 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, 26272 + ... + 27087.

It is an arithmetic number, because the mean of its divisors is an integer number (1800900).

Almost surely, 2^21770472 is an apocalyptic number.

It is an amenable number.

21770472 is an abundant number, since it is smaller than the sum of its proper divisors (35858328).

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

21770472 is a wasteful number, since it uses less digits than its factorization.

21770472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53385 (or 53381 counting only the distinct ones).

The product of its (nonzero) digits is 5488, while the sum is 30.

The square root of 21770472 is about 4665.8838391027. The cubic root of 21770472 is about 279.2260600246.

The spelling of 21770472 in words is "twenty-one million, seven hundred seventy thousand, four hundred seventy-two".