21477489684 has 192 divisors, whose sum is σ = 59488665600. Its totient is φ = 6027799680.

The previous prime is 21477489673. The next prime is 21477489707. The reversal of 21477489684 is 48698477412.

It is a super-2 number, since 2×21477489684² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 94614379 + ... + 94614605.

It is an arithmetic number, because the mean of its divisors is an integer number (309836800).

Almost surely, 2^21477489684 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21477489684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29744332800).

21477489684 is an abundant number, since it is smaller than the sum of its proper divisors (38011175916).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21477489684 is a wasteful number, since it uses less digits than its factorization.

21477489684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563 (or 547 counting only the distinct ones).

The product of its digits is 21676032, while the sum is 60.

The spelling of 21477489684 in words is "twenty-one billion, four hundred seventy-seven million, four hundred eighty-nine thousand, six hundred eighty-four".