21638346430 has 16 divisors (see below), whose sum is σ = 38951675280. Its totient is φ = 8654749312.

The previous prime is 21638346413. The next prime is 21638346469. The reversal of 21638346430 is 3464383612.

It is a congruent number.

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, 100086 + ... + 230854.

It is an arithmetic number, because the mean of its divisors is an integer number (2434479705).

Almost surely, 2^21638346430 is an apocalyptic number.

21638346430 is a deficient number, since it is larger than the sum of its proper divisors (17313328850).

21638346430 is a wasteful number, since it uses less digits than its factorization.

21638346430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147323.

The product of its (nonzero) digits is 248832, while the sum is 40.

The spelling of 21638346430 in words is "twenty-one billion, six hundred thirty-eight million, three hundred forty-six thousand, four hundred thirty".