21430677 has 8 divisors (see below), whose sum is σ = 28634400. Its totient is φ = 14257040.

The previous prime is 21430667. The next prime is 21430679. The reversal of 21430677 is 77603412.

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 21430677 - 2²⁰ = 20382101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21430679) 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, 5802 + ... + 8747.

It is an arithmetic number, because the mean of its divisors is an integer number (3579300).

Almost surely, 2^21430677 is an apocalyptic number.

It is an amenable number.

21430677 is a deficient number, since it is larger than the sum of its proper divisors (7203723).

21430677 is a wasteful number, since it uses less digits than its factorization.

21430677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15043.

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 21430677 is about 4629.3279209838. The cubic root of 21430677 is about 277.7657093009.

The spelling of 21430677 in words is "twenty-one million, four hundred thirty thousand, six hundred seventy-seven".