21455515530234 has 64 divisors (see below), whose sum is σ = 50685254928000. Its totient is φ = 6708342499200.

The previous prime is 21455515530149. The next prime is 21455515530269. The reversal of 21455515530234 is 43203551555412.

21455515530234 is a `hidden beast` number, since 2 + 1 + 4 + 55 + 515 + 53 + 0 + 2 + 34 = 666.

It is a super-2 number, since 2×21455515530234² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21455515530234.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103420179 + ... + 103627430.

It is an arithmetic number, because the mean of its divisors is an integer number (791957108250).

Almost surely, 2^{21455515530234} is an apocalyptic number.

21455515530234 is an abundant number, since it is smaller than the sum of its proper divisors (29229739397766).

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

21455515530234 is a wasteful number, since it uses less digits than its factorization.

21455515530234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207047740 (or 207047734 counting only the distinct ones).

The product of its (nonzero) digits is 1800000, while the sum is 45.

The spelling of 21455515530234 in words is "twenty-one trillion, four hundred fifty-five billion, five hundred fifteen million, five hundred thirty thousand, two hundred thirty-four".