21506137404716 has 24 divisors (see below), whose sum is σ = 37783752202560. Its totient is φ = 10710841059072.

The previous prime is 21506137404511. The next prime is 21506137404721. The reversal of 21506137404716 is 61740473160512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6277055 + ... + 9078198.

It is an arithmetic number, because the mean of its divisors is an integer number (1574323008440).

Almost surely, 2^{21506137404716} is an apocalyptic number.

It is an amenable number.

21506137404716 is a deficient number, since it is larger than the sum of its proper divisors (16277614797844).

21506137404716 is a wasteful number, since it uses less digits than its factorization.

21506137404716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15356633 (or 15356631 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 47.

The spelling of 21506137404716 in words is "twenty-one trillion, five hundred six billion, one hundred thirty-seven million, four hundred four thousand, seven hundred sixteen".