21226995 has 32 divisors (see below), whose sum is σ = 38149440. Its totient is φ = 11197440.

The previous prime is 21226969. The next prime is 21227023. The reversal of 21226995 is 59962212.

It is a happy number.

It is not a de Polignac number, because 21226995 - 2⁹ = 21226483 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12285 + ... + 13905.

It is an arithmetic number, because the mean of its divisors is an integer number (1192170).

Almost surely, 2^21226995 is an apocalyptic number.

21226995 is a deficient number, since it is larger than the sum of its proper divisors (16922445).

21226995 is a wasteful number, since it uses less digits than its factorization.

21226995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1732 (or 1726 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 21226995 is about 4607.2763103595. The cubic root of 21226995 is about 276.8829239325.

The spelling of 21226995 in words is "twenty-one million, two hundred twenty-six thousand, nine hundred ninety-five".