40291210021 has 2 divisors, whose sum is σ = 40291210022. Its totient is φ = 40291210020.

The previous prime is 40291209991. The next prime is 40291210039. The reversal of 40291210021 is 12001219204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30699945796 + 9591264225 = 175214^2 + 97935^2 .

It is a cyclic number.

It is not a de Polignac number, because 40291210021 - 2²¹ = 40289112869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40291209974 and 40291210001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40291210721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20145605010 + 20145605011.

It is an arithmetic number, because the mean of its divisors is an integer number (20145605011).

Almost surely, 2^40291210021 is an apocalyptic number.

It is an amenable number.

40291210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

40291210021 is an equidigital number, since it uses as much as digits as its factorization.

40291210021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 40291210021 its reverse (12001219204), we get a palindrome (52292429225).

The spelling of 40291210021 in words is "forty billion, two hundred ninety-one million, two hundred ten thousand, twenty-one".