42749697021 has 16 divisors (see below), whose sum is σ = 58086020160. Its totient is φ = 27956789120.

The previous prime is 42749697013. The next prime is 42749697041. The reversal of 42749697021 is 12079694724.

It is a cyclic number.

It is not a de Polignac number, because 42749697021 - 2³ = 42749697013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42749697041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 933385 + ... + 978113.

It is an arithmetic number, because the mean of its divisors is an integer number (3630376260).

Almost surely, 2^42749697021 is an apocalyptic number.

It is an amenable number.

42749697021 is a deficient number, since it is larger than the sum of its proper divisors (15336323139).

42749697021 is a wasteful number, since it uses less digits than its factorization.

42749697021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50796.

The product of its (nonzero) digits is 1524096, while the sum is 51.

The spelling of 42749697021 in words is "forty-two billion, seven hundred forty-nine million, six hundred ninety-seven thousand, twenty-one".