21472899 has 8 divisors (see below), whose sum is σ = 32720640. Its totient is φ = 12270216.

The previous prime is 21472879. The next prime is 21472901. The reversal of 21472899 is 99827412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21472899 - 2⁷ = 21472771 is a prime.

It is a super-2 number, since 2×21472899² = 922170782928402, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21472899.

It is not an unprimeable number, because it can be changed into a prime (21472849) 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, 511239 + ... + 511280.

It is an arithmetic number, because the mean of its divisors is an integer number (4090080).

Almost surely, 2^21472899 is an apocalyptic number.

21472899 is a deficient number, since it is larger than the sum of its proper divisors (11247741).

21472899 is a wasteful number, since it uses less digits than its factorization.

21472899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022529.

The product of its digits is 72576, while the sum is 42.

The square root of 21472899 is about 4633.8859502582. The cubic root of 21472899 is about 277.9480045262.

The spelling of 21472899 in words is "twenty-one million, four hundred seventy-two thousand, eight hundred ninety-nine".