21537511714 has 4 divisors (see below), whose sum is σ = 32306267574. Its totient is φ = 10768755856.

The previous prime is 21537511687. The next prime is 21537511717. The reversal of 21537511714 is 41711573512.

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

It can be written as a sum of positive squares in only one way, i.e., 21244520025 + 292991689 = 145755^2 + 17117^2 .

It is not an unprimeable number, because it can be changed into a prime (21537511717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5384377927 + ... + 5384377930.

Almost surely, 2^21537511714 is an apocalyptic number.

21537511714 is a deficient number, since it is larger than the sum of its proper divisors (10768755860).

21537511714 is a wasteful number, since it uses less digits than its factorization.

21537511714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10768755859.

The product of its digits is 29400, while the sum is 37.

The spelling of 21537511714 in words is "twenty-one billion, five hundred thirty-seven million, five hundred eleven thousand, seven hundred fourteen".