21376001 has 4 divisors (see below), whose sum is σ = 21495600. Its totient is φ = 21256404.

The previous prime is 21375971. The next prime is 21376009. The reversal of 21376001 is 10067312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21376001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21376009) 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, 59531 + ... + 59888.

It is an arithmetic number, because the mean of its divisors is an integer number (5373900).

Almost surely, 2^21376001 is an apocalyptic number.

It is an amenable number.

21376001 is a deficient number, since it is larger than the sum of its proper divisors (119599).

21376001 is a wasteful number, since it uses less digits than its factorization.

21376001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119598.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 21376001 is about 4623.4187567210. The cubic root of 21376001 is about 277.5292872804.

The spelling of 21376001 in words is "twenty-one million, three hundred seventy-six thousand, one".