40215120021 has 6 divisors (see below), whose sum is σ = 58088506710. Its totient is φ = 26810080008.

The previous prime is 40215119983. The next prime is 40215120031. The reversal of 40215120021 is 12002151204.

It can be written as a sum of positive squares in only one way, i.e., 35302652100 + 4912467921 = 187890^2 + 70089^2 .

It is not a de Polignac number, because 40215120021 - 2⁹ = 40215119509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40215119976 and 40215120003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40215120031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2234173326 + ... + 2234173343.

It is an arithmetic number, because the mean of its divisors is an integer number (9681417785).

Almost surely, 2^40215120021 is an apocalyptic number.

It is an amenable number.

40215120021 is a deficient number, since it is larger than the sum of its proper divisors (17873386689).

40215120021 is a wasteful number, since it uses less digits than its factorization.

40215120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4468346675 (or 4468346672 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

Adding to 40215120021 its reverse (12002151204), we get a palindrome (52217271225).

The spelling of 40215120021 in words is "forty billion, two hundred fifteen million, one hundred twenty thousand, twenty-one".