21895401 has 32 divisors (see below), whose sum is σ = 33033600. Its totient is φ = 12787200.

The previous prime is 21895397. The next prime is 21895409. The reversal of 21895401 is 10459812.

It is a happy number.

It is not a de Polignac number, because 21895401 - 2² = 21895397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21895409) 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, 146875 + ... + 147023.

It is an arithmetic number, because the mean of its divisors is an integer number (1032300).

Almost surely, 2^21895401 is an apocalyptic number.

It is an amenable number.

21895401 is a deficient number, since it is larger than the sum of its proper divisors (11138199).

21895401 is a wasteful number, since it uses less digits than its factorization.

21895401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 21895401 is about 4679.2521838431. The cubic root of 21895401 is about 279.7591508801.

The spelling of 21895401 in words is "twenty-one million, eight hundred ninety-five thousand, four hundred one".