21115654363354 has 16 divisors (see below), whose sum is σ = 31713559403040. Its totient is φ = 10544470382160.

The previous prime is 21115654363319. The next prime is 21115654363373. The reversal of 21115654363354 is 45336345651112.

It is a junction number, because it is equal to n+sod(n) for n = 21115654363298 and 21115654363307.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16517409 + ... + 17749819.

It is an arithmetic number, because the mean of its divisors is an integer number (1982097462690).

Almost surely, 2^{21115654363354} is an apocalyptic number.

21115654363354 is a deficient number, since it is larger than the sum of its proper divisors (10597905039686).

21115654363354 is a wasteful number, since it uses less digits than its factorization.

21115654363354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1243245.

The product of its digits is 3888000, while the sum is 49.

The spelling of 21115654363354 in words is "twenty-one trillion, one hundred fifteen billion, six hundred fifty-four million, three hundred sixty-three thousand, three hundred fifty-four".