21942195 has 32 divisors (see below), whose sum is σ = 38859264. Its totient is φ = 10483200.

The previous prime is 21942191. The next prime is 21942199. The reversal of 21942195 is 59124912.

It is an interprime number because it is at equal distance from previous prime (21942191) and next prime (21942199).

It is not a de Polignac number, because 21942195 - 2² = 21942191 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (21942191) 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, 10779 + ... + 12651.

It is an arithmetic number, because the mean of its divisors is an integer number (1214352).

Almost surely, 2^21942195 is an apocalyptic number.

21942195 is a deficient number, since it is larger than the sum of its proper divisors (16917069).

21942195 is a wasteful number, since it uses less digits than its factorization.

21942195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1963.

The product of its digits is 6480, while the sum is 33.

The square root of 21942195 is about 4684.2496731067. The cubic root of 21942195 is about 279.9583058666.

The spelling of 21942195 in words is "twenty-one million, nine hundred forty-two thousand, one hundred ninety-five".