9942545021 has 16 divisors (see below), whose sum is σ = 10339617600. Its totient is φ = 9552521088.

The previous prime is 9942545003. The next prime is 9942545023. The reversal of 9942545021 is 1205452499.

It is a cyclic number.

It is not a de Polignac number, because 9942545021 - 2⁶ = 9942544957 is a prime.

It is a super-2 number, since 2×9942545021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9942545021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9942545023) 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, 3354086 + ... + 3357048.

It is an arithmetic number, because the mean of its divisors is an integer number (646226100).

Almost surely, 2^9942545021 is an apocalyptic number.

It is an amenable number.

9942545021 is a deficient number, since it is larger than the sum of its proper divisors (397072579).

9942545021 is a wasteful number, since it uses less digits than its factorization.

9942545021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4108.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 9942545021 is about 99712.3112810048. The cubic root of 9942545021 is about 2150.3006625496.

The spelling of 9942545021 in words is "nine billion, nine hundred forty-two million, five hundred forty-five thousand, twenty-one".