40032656021 has 2 divisors, whose sum is σ = 40032656022. Its totient is φ = 40032656020.

The previous prime is 40032655979. The next prime is 40032656063. The reversal of 40032656021 is 12065623004.

It is a balanced prime because it is at equal distance from previous prime (40032655979) and next prime (40032656063).

It can be written as a sum of positive squares in only one way, i.e., 30703800625 + 9328855396 = 175225^2 + 96586^2 .

It is a cyclic number.

It is not a de Polignac number, because 40032656021 - 2²⁶ = 39965547157 is a prime.

It is a super-2 number, since 2×40032656021² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40032256021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20016328010 + 20016328011.

It is an arithmetic number, because the mean of its divisors is an integer number (20016328011).

Almost surely, 2^40032656021 is an apocalyptic number.

It is an amenable number.

40032656021 is a deficient number, since it is larger than the sum of its proper divisors (1).

40032656021 is an equidigital number, since it uses as much as digits as its factorization.

40032656021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 29.

The spelling of 40032656021 in words is "forty billion, thirty-two million, six hundred fifty-six thousand, twenty-one".