21506340451514 has 4 divisors (see below), whose sum is σ = 32259510677274. Its totient is φ = 10753170225756.

The previous prime is 21506340451439. The next prime is 21506340451529. The reversal of 21506340451514 is 41515404360512.

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., 11579272425889 + 9927068025625 = 3402833^2 + 3150725^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5376585112877 + ... + 5376585112880.

Almost surely, 2^{21506340451514} is an apocalyptic number.

21506340451514 is a deficient number, since it is larger than the sum of its proper divisors (10753170225760).

21506340451514 is a wasteful number, since it uses less digits than its factorization.

21506340451514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10753170225759.

The product of its (nonzero) digits is 288000, while the sum is 41.

The spelling of 21506340451514 in words is "twenty-one trillion, five hundred six billion, three hundred forty million, four hundred fifty-one thousand, five hundred fourteen".