21477572 has 12 divisors (see below), whose sum is σ = 38062080. Its totient is φ = 10602696.

The previous prime is 21477559. The next prime is 21477583. The reversal of 21477572 is 27577412.

It is a super-2 number, since 2×21477572² = 922572198030368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33668 + ... + 34299.

It is an arithmetic number, because the mean of its divisors is an integer number (3171840).

Almost surely, 2^21477572 is an apocalyptic number.

It is an amenable number.

21477572 is a deficient number, since it is larger than the sum of its proper divisors (16584508).

21477572 is a wasteful number, since it uses less digits than its factorization.

21477572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68050 (or 68048 counting only the distinct ones).

The product of its digits is 27440, while the sum is 35.

The square root of 21477572 is about 4634.3901432659. The cubic root of 21477572 is about 277.9681657041.

The spelling of 21477572 in words is "twenty-one million, four hundred seventy-seven thousand, five hundred seventy-two".