40542413021 has 4 divisors (see below), whose sum is σ = 44228086944. Its totient is φ = 36856739100.

The previous prime is 40542413011. The next prime is 40542413027. The reversal of 40542413021 is 12031424504.

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 a de Polignac number, because none of the positive numbers 2^k-40542413021 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 (40542413027) 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, 1842836945 + ... + 1842836966.

It is an arithmetic number, because the mean of its divisors is an integer number (11057021736).

Almost surely, 2^40542413021 is an apocalyptic number.

It is an amenable number.

40542413021 is a deficient number, since it is larger than the sum of its proper divisors (3685673923).

40542413021 is a wasteful number, since it uses less digits than its factorization.

40542413021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3685673922.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 40542413021 its reverse (12031424504), we get a palindrome (52573837525).

The spelling of 40542413021 in words is "forty billion, five hundred forty-two million, four hundred thirteen thousand, twenty-one".