21712562342 has 4 divisors (see below), whose sum is σ = 32568843516. Its totient is φ = 10856281170.

The previous prime is 21712562309. The next prime is 21712562357. The reversal of 21712562342 is 24326521712.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5428140584 + ... + 5428140587.

It is an arithmetic number, because the mean of its divisors is an integer number (8142210879).

Almost surely, 2^21712562342 is an apocalyptic number.

21712562342 is a deficient number, since it is larger than the sum of its proper divisors (10856281174).

21712562342 is a wasteful number, since it uses less digits than its factorization.

21712562342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10856281173.

The product of its digits is 40320, while the sum is 35.

The spelling of 21712562342 in words is "twenty-one billion, seven hundred twelve million, five hundred sixty-two thousand, three hundred forty-two".