6942123151821 has 24 divisors (see below), whose sum is σ = 11780572623456. Its totient is φ = 3883705259040.

The previous prime is 6942123151807. The next prime is 6942123151829. The reversal of 6942123151821 is 1281513212496.

6942123151821 is a `hidden beast` number, since 6 + 9 + 4 + 2 + 123 + 1 + 518 + 2 + 1 = 666.

It is not a de Polignac number, because 6942123151821 - 2⁷ = 6942123151693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6942123151829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2697016255 + ... + 2697018828.

It is an arithmetic number, because the mean of its divisors is an integer number (490857192644).

Almost surely, 2^{6942123151821} is an apocalyptic number.

It is an amenable number.

6942123151821 is a deficient number, since it is larger than the sum of its proper divisors (4838449471635).

6942123151821 is a wasteful number, since it uses less digits than its factorization.

6942123151821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5394035113 (or 5394035110 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The spelling of 6942123151821 in words is "six trillion, nine hundred forty-two billion, one hundred twenty-three million, one hundred fifty-one thousand, eight hundred twenty-one".