21934406351 has 16 divisors (see below), whose sum is σ = 25806936960. Its totient is φ = 18379463520.

The previous prime is 21934406321. The next prime is 21934406353. The reversal of 21934406351 is 15360443912.

It is a de Polignac number, because none of the positive numbers 2^k-21934406351 is a prime.

It is a super-2 number, since 2×21934406351² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21934406353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14621 + ... + 209958.

It is an arithmetic number, because the mean of its divisors is an integer number (1612933560).

Almost surely, 2^21934406351 is an apocalyptic number.

21934406351 is a deficient number, since it is larger than the sum of its proper divisors (3872530609).

21934406351 is a wasteful number, since it uses less digits than its factorization.

21934406351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225286.

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 21934406351 in words is "twenty-one billion, nine hundred thirty-four million, four hundred six thousand, three hundred fifty-one".