21738618294 has 32 divisors (see below), whose sum is σ = 43622408544. Its totient is φ = 7222037760.

The previous prime is 21738618259. The next prime is 21738618361. The reversal of 21738618294 is 49281683712.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5640072 + ... + 5643924.

It is an arithmetic number, because the mean of its divisors is an integer number (1363200267).

Almost surely, 2^21738618294 is an apocalyptic number.

21738618294 is an abundant number, since it is smaller than the sum of its proper divisors (21883790250).

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

21738618294 is a wasteful number, since it uses less digits than its factorization.

21738618294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6752.

The product of its digits is 1161216, while the sum is 51.

The spelling of 21738618294 in words is "twenty-one billion, seven hundred thirty-eight million, six hundred eighteen thousand, two hundred ninety-four".