21415079 has 32 divisors (see below), whose sum is σ = 27095040. Its totient is φ = 16531200.

The previous prime is 21415067. The next prime is 21415081. The reversal of 21415079 is 97051412.

It is not a de Polignac number, because 21415079 - 2²⁰ = 20366503 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21415099) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 257972 + ... + 258054.

It is an arithmetic number, because the mean of its divisors is an integer number (846720).

Almost surely, 2^21415079 is an apocalyptic number.

21415079 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21415079 is a deficient number, since it is larger than the sum of its proper divisors (5679961).

21415079 is a wasteful number, since it uses less digits than its factorization.

21415079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 21415079 is about 4627.6429205374. The cubic root of 21415079 is about 277.6983037293.

The spelling of 21415079 in words is "twenty-one million, four hundred fifteen thousand, seventy-nine".