21455358492 has 48 divisors (see below), whose sum is σ = 52301642400. Its totient is φ = 6836793600.

The previous prime is 21455358481. The next prime is 21455358497. The reversal of 21455358492 is 29485355412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21455358497) 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, 270067 + ... + 340362.

It is an arithmetic number, because the mean of its divisors is an integer number (1089617550).

Almost surely, 2^21455358492 is an apocalyptic number.

It is an amenable number.

21455358492 is an abundant number, since it is smaller than the sum of its proper divisors (30846283908).

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

21455358492 is a wasteful number, since it uses less digits than its factorization.

21455358492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610566 (or 610564 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 48.

The spelling of 21455358492 in words is "twenty-one billion, four hundred fifty-five million, three hundred fifty-eight thousand, four hundred ninety-two".