74126381081021 has 4 divisors (see below), whose sum is σ = 75019470009792. Its totient is φ = 73233292152252.

The previous prime is 74126381081009. The next prime is 74126381081099. The reversal of 74126381081021 is 12018018362147.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 74126381081021 - 2¹⁸ = 74126380818877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74126381089021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 446544464261 + ... + 446544464426.

It is an arithmetic number, because the mean of its divisors is an integer number (18754867502448).

Almost surely, 2^{74126381081021} is an apocalyptic number.

It is an amenable number.

74126381081021 is a deficient number, since it is larger than the sum of its proper divisors (893088928771).

74126381081021 is an equidigital number, since it uses as much as digits as its factorization.

74126381081021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893088928770.

The product of its (nonzero) digits is 129024, while the sum is 44.

The spelling of 74126381081021 in words is "seventy-four trillion, one hundred twenty-six billion, three hundred eighty-one million, eighty-one thousand, twenty-one".