21400677 has 12 divisors (see below), whose sum is σ = 30956640. Its totient is φ = 14246568.

The previous prime is 21400667. The next prime is 21400681. The reversal of 21400677 is 77600412.

It is not a de Polignac number, because 21400677 - 2¹⁵ = 21367909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21400677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7474 + ... + 9932.

It is an arithmetic number, because the mean of its divisors is an integer number (2579720).

Almost surely, 2^21400677 is an apocalyptic number.

It is an amenable number.

21400677 is a deficient number, since it is larger than the sum of its proper divisors (9555963).

21400677 is a wasteful number, since it uses less digits than its factorization.

21400677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3432 (or 3429 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 21400677 is about 4626.0865750654. The cubic root of 21400677 is about 277.6360375124.

The spelling of 21400677 in words is "twenty-one million, four hundred thousand, six hundred seventy-seven".