21952377 has 14 divisors (see below), whose sum is σ = 32914602. Its totient is φ = 14634432.

The previous prime is 21952339. The next prime is 21952387. The reversal of 21952377 is 77325912.

It can be written as a sum of positive squares in only one way, i.e., 21566736 + 385641 = 4644^2 + 621^2 .

It is not a de Polignac number, because 21952377 - 2⁶ = 21952313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21952387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 14328 + ... + 15785.

It is an arithmetic number, because the mean of its divisors is an integer number (2351043).

Almost surely, 2^21952377 is an apocalyptic number.

21952377 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21952377 is a deficient number, since it is larger than the sum of its proper divisors (10962225).

21952377 is an frugal number, since it uses more digits than its factorization.

21952377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30131 (or 30116 counting only the distinct ones).

The product of its digits is 26460, while the sum is 36.

The square root of 21952377 is about 4685.3363806668. The cubic root of 21952377 is about 280.0016028820.

The spelling of 21952377 in words is "twenty-one million, nine hundred fifty-two thousand, three hundred seventy-seven".