21479627 has 4 divisors (see below), whose sum is σ = 23131920. Its totient is φ = 19827336.

The previous prime is 21479587. The next prime is 21479639. The reversal of 21479627 is 72697412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21479627 - 2⁸ = 21479371 is a prime.

It is a super-2 number, since 2×21479627² = 922748752118258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21479657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 826127 + ... + 826152.

It is an arithmetic number, because the mean of its divisors is an integer number (5782980).

Almost surely, 2^21479627 is an apocalyptic number.

21479627 is a deficient number, since it is larger than the sum of its proper divisors (1652293).

21479627 is a wasteful number, since it uses less digits than its factorization.

21479627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652292.

The product of its digits is 42336, while the sum is 38.

The square root of 21479627 is about 4634.6118499827. The cubic root of 21479627 is about 277.9770308646.

The spelling of 21479627 in words is "twenty-one million, four hundred seventy-nine thousand, six hundred twenty-seven".