21952917 has 32 divisors (see below), whose sum is σ = 38088960. Its totient is φ = 12234240.

The previous prime is 21952891. The next prime is 21952921. The reversal of 21952917 is 71925912.

It is not a de Polignac number, because 21952917 - 2¹⁰ = 21951893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21952937) 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, 6333 + ... + 9165.

It is an arithmetic number, because the mean of its divisors is an integer number (1190280).

Almost surely, 2^21952917 is an apocalyptic number.

21952917 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21952917 is a deficient number, since it is larger than the sum of its proper divisors (16136043).

21952917 is a wasteful number, since it uses less digits than its factorization.

21952917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2890 (or 2884 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 21952917 is about 4685.3940069113. The cubic root of 21952917 is about 280.0038987552.

The spelling of 21952917 in words is "twenty-one million, nine hundred fifty-two thousand, nine hundred seventeen".