40011000021 has 12 divisors (see below), whose sum is σ = 57868831020. Its totient is φ = 26639308800.

The previous prime is 40010999999. The next prime is 40011000041. The reversal of 40011000021 is 12000011004.

It is a happy number.

40011000021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 18194232996 + 21816767025 = 134886^2 + 147705^2 .

It is a de Polignac number, because none of the positive numbers 2^k-40011000021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 40010999967 and 40011000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40011000041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2883630 + ... + 2897471.

It is an arithmetic number, because the mean of its divisors is an integer number (4822402585).

Almost surely, 2^40011000021 is an apocalyptic number.

It is an amenable number.

40011000021 is a deficient number, since it is larger than the sum of its proper divisors (17857830999).

40011000021 is a wasteful number, since it uses less digits than its factorization.

40011000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5781876 (or 5781873 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 40011000021 its reverse (12000011004), we get a palindrome (52011011025).

The spelling of 40011000021 in words is "forty billion, eleven million, twenty-one", and thus it is an aban number and an uban number.