21495976494 has 16 divisors (see below), whose sum is σ = 43906675968. Its totient is φ = 7012871672.

The previous prime is 21495976493. The next prime is 21495976517. The reversal of 21495976494 is 49467959412.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21495976493) 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, 38113152 + ... + 38113715.

It is an arithmetic number, because the mean of its divisors is an integer number (2744167248).

Almost surely, 2^21495976494 is an apocalyptic number.

21495976494 is an abundant number, since it is smaller than the sum of its proper divisors (22410699474).

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

21495976494 is a wasteful number, since it uses less digits than its factorization.

21495976494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76226919.

The product of its digits is 19595520, while the sum is 60.

The spelling of 21495976494 in words is "twenty-one billion, four hundred ninety-five million, nine hundred seventy-six thousand, four hundred ninety-four".