21534042156674 has 8 divisors (see below), whose sum is σ = 32597403265020. Its totient is φ = 10668241068336.

The previous prime is 21534042156631. The next prime is 21534042156689. The reversal of 21534042156674 is 47665124043512.

It can be written as a sum of positive squares in 2 ways, for example, as 18997332939649 + 2536709217025 = 4358593^2 + 1592705^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49390004729 + ... + 49390005164.

Almost surely, 2^{21534042156674} is an apocalyptic number.

21534042156674 is a deficient number, since it is larger than the sum of its proper divisors (11063361108346).

21534042156674 is a wasteful number, since it uses less digits than its factorization.

21534042156674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98780010004.

The product of its (nonzero) digits is 4838400, while the sum is 50.

The spelling of 21534042156674 in words is "twenty-one trillion, five hundred thirty-four billion, forty-two million, one hundred fifty-six thousand, six hundred seventy-four".