21301772 has 18 divisors (see below), whose sum is σ = 38973228. Its totient is φ = 10186792.

The previous prime is 21301769. The next prime is 21301783. The reversal of 21301772 is 27710312.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2918 + ... + 7149.

Almost surely, 2^21301772 is an apocalyptic number.

It is an amenable number.

21301772 is a deficient number, since it is larger than the sum of its proper divisors (17671456).

21301772 is a wasteful number, since it uses less digits than its factorization.

21301772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10117 (or 10092 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 21301772 is about 4615.3842743590. The cubic root of 21301772 is about 277.2076709472.

The spelling of 21301772 in words is "twenty-one million, three hundred one thousand, seven hundred seventy-two".