42907945690621 has 4 divisors (see below), whose sum is σ = 46808668026144. Its totient is φ = 39007223355100.

The previous prime is 42907945690607. The next prime is 42907945690639. The reversal of 42907945690621 is 12609654970924.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 42907945690621 - 2³⁹ = 42358189876733 is a prime.

It is a super-3 number, since 3×42907945690621³ (a number of 42 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42907945690651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1950361167745 + ... + 1950361167766.

It is an arithmetic number, because the mean of its divisors is an integer number (11702167006536).

Almost surely, 2^{42907945690621} is an apocalyptic number.

It is an amenable number.

42907945690621 is a deficient number, since it is larger than the sum of its proper divisors (3900722335523).

42907945690621 is a wasteful number, since it uses less digits than its factorization.

42907945690621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3900722335522.

The product of its (nonzero) digits is 58786560, while the sum is 64.

The spelling of 42907945690621 in words is "forty-two trillion, nine hundred seven billion, nine hundred forty-five million, six hundred ninety thousand, six hundred twenty-one".