21377051 has 8 divisors (see below), whose sum is σ = 22407840. Its totient is φ = 20354752.

The previous prime is 21377039. The next prime is 21377077. The reversal of 21377051 is 15077312.

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 21377051 - 2¹⁰ = 21376027 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21377051.

It is not an unprimeable number, because it can be changed into a prime (21377351) 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, 3365 + ... + 7353.

It is an arithmetic number, because the mean of its divisors is an integer number (2800980).

Almost surely, 2^21377051 is an apocalyptic number.

21377051 is a deficient number, since it is larger than the sum of its proper divisors (1030789).

21377051 is a wasteful number, since it uses less digits than its factorization.

21377051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4245.

The product of its (nonzero) digits is 1470, while the sum is 26.

The square root of 21377051 is about 4623.5323076626. The cubic root of 21377051 is about 277.5338313324.

The spelling of 21377051 in words is "twenty-one million, three hundred seventy-seven thousand, fifty-one".