21952113 has 4 divisors (see below), whose sum is σ = 29269488. Its totient is φ = 14634740.

The previous prime is 21952111. The next prime is 21952129. The reversal of 21952113 is 31125912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21952113 - 2¹ = 21952111 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21952111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3658683 + ... + 3658688.

It is an arithmetic number, because the mean of its divisors is an integer number (7317372).

Almost surely, 2^21952113 is an apocalyptic number.

It is an amenable number.

21952113 is a deficient number, since it is larger than the sum of its proper divisors (7317375).

21952113 is an equidigital number, since it uses as much as digits as its factorization.

21952113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7317374.

The product of its digits is 540, while the sum is 24.

The square root of 21952113 is about 4685.3082075782. The cubic root of 21952113 is about 280.0004804414. Note that the first 3 decimals are identical.

The spelling of 21952113 in words is "twenty-one million, nine hundred fifty-two thousand, one hundred thirteen".