21377461 has 8 divisors (see below), whose sum is σ = 24776064. Its totient is φ = 18065040.

The previous prime is 21377459. The next prime is 21377501. The reversal of 21377461 is 16477312.

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

It is not a de Polignac number, because 21377461 - 2¹ = 21377459 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 (21377561) 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, 21010 + ... + 22003.

It is an arithmetic number, because the mean of its divisors is an integer number (3097008).

Almost surely, 2^21377461 is an apocalyptic number.

It is an amenable number.

21377461 is a deficient number, since it is larger than the sum of its proper divisors (3398603).

21377461 is an equidigital number, since it uses as much as digits as its factorization.

21377461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43091.

The product of its digits is 7056, while the sum is 31.

The square root of 21377461 is about 4623.5766458446. The cubic root of 21377461 is about 277.5356056361.

The spelling of 21377461 in words is "twenty-one million, three hundred seventy-seven thousand, four hundred sixty-one".