40400010021 has 32 divisors (see below), whose sum is σ = 62475798528. Its totient is φ = 22745298240.

The previous prime is 40400010011. The next prime is 40400010029. The reversal of 40400010021 is 12001000404.

It is not a de Polignac number, because 40400010021 - 2⁷ = 40400009893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40400009979 and 40400010006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40400010029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 378706 + ... + 473516.

It is an arithmetic number, because the mean of its divisors is an integer number (1952368704).

Almost surely, 2^40400010021 is an apocalyptic number.

It is an amenable number.

40400010021 is a deficient number, since it is larger than the sum of its proper divisors (22075788507).

40400010021 is a wasteful number, since it uses less digits than its factorization.

40400010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95121.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 40400010021 its reverse (12001000404), we get a palindrome (52401010425).

The spelling of 40400010021 in words is "forty billion, four hundred million, ten thousand, twenty-one".