21422895 has 32 divisors (see below), whose sum is σ = 37539264. Its totient is φ = 10368000.

The previous prime is 21422837. The next prime is 21422897. The reversal of 21422895 is 59822412.

It is not a de Polignac number, because 21422895 - 2²¹ = 19325743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21422897) 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, 10995 + ... + 12795.

It is an arithmetic number, because the mean of its divisors is an integer number (1173102).

Almost surely, 2^21422895 is an apocalyptic number.

21422895 is a deficient number, since it is larger than the sum of its proper divisors (16116369).

21422895 is a wasteful number, since it uses less digits than its factorization.

21422895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1883.

The product of its digits is 11520, while the sum is 33.

The square root of 21422895 is about 4628.4873338921. The cubic root of 21422895 is about 277.7320840691.

The spelling of 21422895 in words is "twenty-one million, four hundred twenty-two thousand, eight hundred ninety-five".