40001022010021 has 2 divisors, whose sum is σ = 40001022010022. Its totient is φ = 40001022010020.

The previous prime is 40001022010003. The next prime is 40001022010049. The reversal of 40001022010021 is 12001022010004.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38796765977025 + 1204256032996 = 6228705^2 + 1097386^2 .

It is a cyclic number.

It is not a de Polignac number, because 40001022010021 - 2⁵ = 40001022009989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40001022009983 and 40001022010010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40001022010321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20000511005010 + 20000511005011.

It is an arithmetic number, because the mean of its divisors is an integer number (20000511005011).

Almost surely, 2^{40001022010021} is an apocalyptic number.

It is an amenable number.

40001022010021 is a deficient number, since it is larger than the sum of its proper divisors (1).

40001022010021 is an equidigital number, since it uses as much as digits as its factorization.

40001022010021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 40001022010021 its reverse (12001022010004), we get a palindrome (52002044020025).

The spelling of 40001022010021 in words is "forty trillion, one billion, twenty-two million, ten thousand, twenty-one".