74107121421 has 4 divisors (see below), whose sum is σ = 98809495232. Its totient is φ = 49404747612.

The previous prime is 74107121381. The next prime is 74107121461. The reversal of 74107121421 is 12412170147.

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 an interprime number because it is at equal distance from previous prime (74107121381) and next prime (74107121461).

It is not a de Polignac number, because 74107121421 - 2¹³ = 74107113229 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74107121461) 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, 12351186901 + ... + 12351186906.

It is an arithmetic number, because the mean of its divisors is an integer number (24702373808).

Almost surely, 2^74107121421 is an apocalyptic number.

It is an amenable number.

74107121421 is a deficient number, since it is larger than the sum of its proper divisors (24702373811).

74107121421 is a wasteful number, since it uses less digits than its factorization.

74107121421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24702373810.

The product of its (nonzero) digits is 3136, while the sum is 30.

Adding to 74107121421 its reverse (12412170147), we get a palindrome (86519291568).

The spelling of 74107121421 in words is "seventy-four billion, one hundred seven million, one hundred twenty-one thousand, four hundred twenty-one".