21335901 has 8 divisors (see below), whose sum is σ = 30121344. Its totient is φ = 13387200.

The previous prime is 21335893. The next prime is 21335911. The reversal of 21335901 is 10953312.

It is a happy number.

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

It is not a de Polignac number, because 21335901 - 2³ = 21335893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21335911) 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, 209125 + ... + 209226.

It is an arithmetic number, because the mean of its divisors is an integer number (3765168).

Almost surely, 2^21335901 is an apocalyptic number.

It is an amenable number.

21335901 is a deficient number, since it is larger than the sum of its proper divisors (8785443).

21335901 is a wasteful number, since it uses less digits than its factorization.

21335901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418371.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 21335901 is about 4619.0801032240. The cubic root of 21335901 is about 277.3556362978.

The spelling of 21335901 in words is "twenty-one million, three hundred thirty-five thousand, nine hundred one".