21173305712074 has 4 divisors (see below), whose sum is σ = 31759958568114. Its totient is φ = 10586652856036.

The previous prime is 21173305712057. The next prime is 21173305712077. The reversal of 21173305712074 is 47021750337112.

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., 18885325775625 + 2287979936449 = 4345725^2 + 1512607^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21173305712074.

It is not an unprimeable number, because it can be changed into a prime (21173305712077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5293326428017 + ... + 5293326428020.

Almost surely, 2^{21173305712074} is an apocalyptic number.

21173305712074 is a deficient number, since it is larger than the sum of its proper divisors (10586652856040).

21173305712074 is a wasteful number, since it uses less digits than its factorization.

21173305712074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10586652856039.

The product of its (nonzero) digits is 246960, while the sum is 43.

The spelling of 21173305712074 in words is "twenty-one trillion, one hundred seventy-three billion, three hundred five million, seven hundred twelve thousand, seventy-four".