21952271 has 4 divisors (see below), whose sum is σ = 23947944. Its totient is φ = 19956600.

The previous prime is 21952207. The next prime is 21952291. The reversal of 21952271 is 17225912.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21952271 - 2⁶ = 21952207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21952291) 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, 997820 + ... + 997841.

It is an arithmetic number, because the mean of its divisors is an integer number (5986986).

Almost surely, 2^21952271 is an apocalyptic number.

21952271 is a deficient number, since it is larger than the sum of its proper divisors (1995673).

21952271 is a wasteful number, since it uses less digits than its factorization.

21952271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1995672.

The product of its digits is 2520, while the sum is 29.

The square root of 21952271 is about 4685.3250687652. The cubic root of 21952271 is about 280.0011522061.

The spelling of 21952271 in words is "twenty-one million, nine hundred fifty-two thousand, two hundred seventy-one".