21477007387 has 16 divisors (see below), whose sum is σ = 23883310080. Its totient is φ = 19149624000.

The previous prime is 21477007379. The next prime is 21477007451. The reversal of 21477007387 is 78370077412.

It is a cyclic number.

It is not a de Polignac number, because 21477007387 - 2³ = 21477007379 is a prime.

It is a super-2 number, since 2×21477007387² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21477007787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49383 + ... + 213055.

It is an arithmetic number, because the mean of its divisors is an integer number (1492706880).

Almost surely, 2^21477007387 is an apocalyptic number.

21477007387 is a deficient number, since it is larger than the sum of its proper divisors (2406302693).

21477007387 is a wasteful number, since it uses less digits than its factorization.

21477007387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163914.

The product of its (nonzero) digits is 460992, while the sum is 46.

The spelling of 21477007387 in words is "twenty-one billion, four hundred seventy-seven million, seven thousand, three hundred eighty-seven".