21912377 has 8 divisors (see below), whose sum is σ = 23234400. Its totient is φ = 20607264.

The previous prime is 21912367. The next prime is 21912383. The reversal of 21912377 is 77321912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21912377 - 2²⁴ = 5135161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21912347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1508 + ... + 6789.

It is an arithmetic number, because the mean of its divisors is an integer number (2904300).

Almost surely, 2^21912377 is an apocalyptic number.

It is an amenable number.

21912377 is a deficient number, since it is larger than the sum of its proper divisors (1322023).

21912377 is a wasteful number, since it uses less digits than its factorization.

21912377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8455.

The product of its digits is 5292, while the sum is 32.

The square root of 21912377 is about 4681.0657974440. The cubic root of 21912377 is about 279.8314334032.

The spelling of 21912377 in words is "twenty-one million, nine hundred twelve thousand, three hundred seventy-seven".