69187117421 has 2 divisors, whose sum is σ = 69187117422. Its totient is φ = 69187117420.

The previous prime is 69187117297. The next prime is 69187117451. The reversal of 69187117421 is 12471178196.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67875880900 + 1311236521 = 260530^2 + 36211^2 .

It is a cyclic number.

It is not a de Polignac number, because 69187117421 - 2²⁶ = 69120008557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69187117451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34593558710 + 34593558711.

It is an arithmetic number, because the mean of its divisors is an integer number (34593558711).

Almost surely, 2^69187117421 is an apocalyptic number.

It is an amenable number.

69187117421 is a deficient number, since it is larger than the sum of its proper divisors (1).

69187117421 is an equidigital number, since it uses as much as digits as its factorization.

69187117421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 47.

The spelling of 69187117421 in words is "sixty-nine billion, one hundred eighty-seven million, one hundred seventeen thousand, four hundred twenty-one".