69031961021 has 4 divisors (see below), whose sum is σ = 71412373500. Its totient is φ = 66651548544.

The previous prime is 69031961017. The next prime is 69031961051. The reversal of 69031961021 is 12016913096.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52952452996 + 16079508025 = 230114^2 + 126805^2 .

It is a cyclic number.

It is not a de Polignac number, because 69031961021 - 2² = 69031961017 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 (69031961051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1190206196 + ... + 1190206253.

It is an arithmetic number, because the mean of its divisors is an integer number (17853093375).

Almost surely, 2^69031961021 is an apocalyptic number.

It is an amenable number.

69031961021 is a deficient number, since it is larger than the sum of its proper divisors (2380412479).

69031961021 is a wasteful number, since it uses less digits than its factorization.

69031961021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2380412478.

The product of its (nonzero) digits is 17496, while the sum is 38.

The spelling of 69031961021 in words is "sixty-nine billion, thirty-one million, nine hundred sixty-one thousand, twenty-one".