21372107 has 8 divisors (see below), whose sum is σ = 21873600. Its totient is φ = 20876544.

The previous prime is 21372103. The next prime is 21372133. The reversal of 21372107 is 70127312.

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

It is a cyclic number.

It is not a de Polignac number, because 21372107 - 2² = 21372103 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21372103) 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, 6269 + ... + 9057.

It is an arithmetic number, because the mean of its divisors is an integer number (2734200).

Almost surely, 2^21372107 is an apocalyptic number.

21372107 is a deficient number, since it is larger than the sum of its proper divisors (501493).

21372107 is an equidigital number, since it uses as much as digits as its factorization.

21372107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2965.

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

The square root of 21372107 is about 4622.9976205921. The cubic root of 21372107 is about 277.5124340396.

Adding to 21372107 its reverse (70127312), we get a palindrome (91499419).

The spelling of 21372107 in words is "twenty-one million, three hundred seventy-two thousand, one hundred seven".