21620536176734 has 16 divisors (see below), whose sum is σ = 35907104860416. Its totient is φ = 9680837093400.

The previous prime is 21620536176697. The next prime is 21620536176739. The reversal of 21620536176734 is 43767163502612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21620536176739) by changing a digit.

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, 7333966022 + ... + 7333968969.

It is an arithmetic number, because the mean of its divisors is an integer number (2244194053776).

Almost surely, 2^{21620536176734} is an apocalyptic number.

21620536176734 is a deficient number, since it is larger than the sum of its proper divisors (14286568683682).

21620536176734 is a wasteful number, since it uses less digits than its factorization.

21620536176734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14667935071.

The product of its (nonzero) digits is 7620480, while the sum is 53.

The spelling of 21620536176734 in words is "twenty-one trillion, six hundred twenty billion, five hundred thirty-six million, one hundred seventy-six thousand, seven hundred thirty-four".