69121906721 has 16 divisors (see below), whose sum is σ = 83731221504. Its totient is φ = 55703606784.

The previous prime is 69121906703. The next prime is 69121906727. The reversal of 69121906721 is 12760912196.

It is not a de Polignac number, because 69121906721 - 2²⁶ = 69054797857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (69121906727) 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, 191345 + ... + 418158.

It is an arithmetic number, because the mean of its divisors is an integer number (5233201344).

Almost surely, 2^69121906721 is an apocalyptic number.

It is an amenable number.

69121906721 is a deficient number, since it is larger than the sum of its proper divisors (14609314783).

69121906721 is a wasteful number, since it uses less digits than its factorization.

69121906721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610480.

The product of its (nonzero) digits is 81648, while the sum is 44.

The spelling of 69121906721 in words is "sixty-nine billion, one hundred twenty-one million, nine hundred six thousand, seven hundred twenty-one".