40402124021 has 4 divisors (see below), whose sum is σ = 46173856032. Its totient is φ = 34630392012.

The previous prime is 40402124011. The next prime is 40402124033. The reversal of 40402124021 is 12042120404.

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 a cyclic number.

It is not a de Polignac number, because 40402124021 - 2²⁶ = 40335015157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40402123984 and 40402124002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40402124011) 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, 2885865995 + ... + 2885866008.

It is an arithmetic number, because the mean of its divisors is an integer number (11543464008).

Almost surely, 2^40402124021 is an apocalyptic number.

It is an amenable number.

40402124021 is a deficient number, since it is larger than the sum of its proper divisors (5771732011).

40402124021 is an equidigital number, since it uses as much as digits as its factorization.

40402124021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5771732010.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 40402124021 its reverse (12042120404), we get a palindrome (52444244425).

The spelling of 40402124021 in words is "forty billion, four hundred two million, one hundred twenty-four thousand, twenty-one".