21654013442 has 16 divisors (see below), whose sum is σ = 34234824960. Its totient is φ = 10243881072.

The previous prime is 21654013427. The next prime is 21654013489. The reversal of 21654013442 is 24431045612.

It is a junction number, because it is equal to n+sod(n) for n = 21654013399 and 21654013408.

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, 339218 + ... + 397965.

It is an arithmetic number, because the mean of its divisors is an integer number (2139676560).

Almost surely, 2^21654013442 is an apocalyptic number.

21654013442 is a deficient number, since it is larger than the sum of its proper divisors (12580811518).

21654013442 is a wasteful number, since it uses less digits than its factorization.

21654013442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737977.

The product of its (nonzero) digits is 23040, while the sum is 32.

The spelling of 21654013442 in words is "twenty-one billion, six hundred fifty-four million, thirteen thousand, four hundred forty-two".