21170516534 has 32 divisors (see below), whose sum is σ = 34373154816. Its totient is φ = 9740974720.

The previous prime is 21170516533. The next prime is 21170516539. The reversal of 21170516534 is 43561507112.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21170516494 and 21170516503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21170516533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1756589 + ... + 1768599.

It is an arithmetic number, because the mean of its divisors is an integer number (1074161088).

Almost surely, 2^21170516534 is an apocalyptic number.

21170516534 is a deficient number, since it is larger than the sum of its proper divisors (13202638282).

21170516534 is a wasteful number, since it uses less digits than its factorization.

21170516534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13180.

The product of its (nonzero) digits is 25200, while the sum is 35.

The spelling of 21170516534 in words is "twenty-one billion, one hundred seventy million, five hundred sixteen thousand, five hundred thirty-four".