21494631654 has 48 divisors (see below), whose sum is σ = 47082713184. Its totient is φ = 7086672000.

The previous prime is 21494631647. The next prime is 21494631673. The reversal of 21494631654 is 45613649412.

21494631654 is a `hidden beast` number, since 2 + 1 + 4 + 9 + 4 + 631 + 6 + 5 + 4 = 666.

It is a super-2 number, since 2×21494631654² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 616324 + ... + 650264.

It is an arithmetic number, because the mean of its divisors is an integer number (980889858).

Almost surely, 2^21494631654 is an apocalyptic number.

21494631654 is an abundant number, since it is smaller than the sum of its proper divisors (25588081530).

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

21494631654 is a wasteful number, since it uses less digits than its factorization.

21494631654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34333 (or 34330 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The spelling of 21494631654 in words is "twenty-one billion, four hundred ninety-four million, six hundred thirty-one thousand, six hundred fifty-four".