21115514653254 has 48 divisors (see below), whose sum is σ = 52350507605760. Its totient is φ = 6025565188080.

The previous prime is 21115514653243. The next prime is 21115514653307. The reversal of 21115514653254 is 45235641551112.

21115514653254 is a `hidden beast` number, since 2 + 1 + 1 + 1 + 55 + 14 + 6 + 532 + 54 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 103216834 + ... + 103421205.

It is an arithmetic number, because the mean of its divisors is an integer number (1090635575120).

Almost surely, 2^{21115514653254} is an apocalyptic number.

21115514653254 is an abundant number, since it is smaller than the sum of its proper divisors (31234992952506).

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

21115514653254 is a wasteful number, since it uses less digits than its factorization.

21115514653254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206638865 (or 206638862 counting only the distinct ones).

The product of its digits is 720000, while the sum is 45.

The spelling of 21115514653254 in words is "twenty-one trillion, one hundred fifteen billion, five hundred fourteen million, six hundred fifty-three thousand, two hundred fifty-four".