21479129 has 16 divisors (see below), whose sum is σ = 25448448. Its totient is φ = 17744832.

The previous prime is 21479123. The next prime is 21479131. The reversal of 21479129 is 92197412.

It is not a de Polignac number, because 21479129 - 2⁴ = 21479113 is a prime.

It is a super-2 number, since 2×21479129² = 922705965197282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21479123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32567 + ... + 33219.

It is an arithmetic number, because the mean of its divisors is an integer number (1590528).

Almost surely, 2^21479129 is an apocalyptic number.

It is an amenable number.

21479129 is a deficient number, since it is larger than the sum of its proper divisors (3969319).

21479129 is a wasteful number, since it uses less digits than its factorization.

21479129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824.

The product of its digits is 9072, while the sum is 35.

The square root of 21479129 is about 4634.5581234892. The cubic root of 21479129 is about 277.9748825710.

The spelling of 21479129 in words is "twenty-one million, four hundred seventy-nine thousand, one hundred twenty-nine".