42669357021 has 6 divisors (see below), whose sum is σ = 61633515710. Its totient is φ = 28446238008.

The previous prime is 42669357013. The next prime is 42669357023. The reversal of 42669357021 is 12075396624.

It can be written as a sum of positive squares in only one way, i.e., 42638120100 + 31236921 = 206490^2 + 5589^2 .

It is not a de Polignac number, because 42669357021 - 2³ = 42669357013 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 (42669357023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2370519826 + ... + 2370519843.

Almost surely, 2^42669357021 is an apocalyptic number.

It is an amenable number.

42669357021 is a deficient number, since it is larger than the sum of its proper divisors (18964158689).

42669357021 is a wasteful number, since it uses less digits than its factorization.

42669357021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4741039675 (or 4741039672 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 42669357021 in words is "forty-two billion, six hundred sixty-nine million, three hundred fifty-seven thousand, twenty-one".