74129887221 has 16 divisors (see below), whose sum is σ = 108707660544. Its totient is φ = 44647786944.

The previous prime is 74129887219. The next prime is 74129887231. The reversal of 74129887221 is 12278892147.

It is not a de Polignac number, because 74129887221 - 2¹ = 74129887219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74129887231) 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, 20219086 + ... + 20222751.

It is an arithmetic number, because the mean of its divisors is an integer number (6794228784).

Almost surely, 2^74129887221 is an apocalyptic number.

It is an amenable number.

74129887221 is a deficient number, since it is larger than the sum of its proper divisors (34577773323).

74129887221 is a wasteful number, since it uses less digits than its factorization.

74129887221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40441900.

The product of its digits is 903168, while the sum is 51.

The spelling of 74129887221 in words is "seventy-four billion, one hundred twenty-nine million, eight hundred eighty-seven thousand, two hundred twenty-one".