40525031021 has 2 divisors, whose sum is σ = 40525031022. Its totient is φ = 40525031020.

The previous prime is 40525030981. The next prime is 40525031081. The reversal of 40525031021 is 12013052504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31192504996 + 9332526025 = 176614^2 + 96605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40525031021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40525031081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20262515510 + 20262515511.

It is an arithmetic number, because the mean of its divisors is an integer number (20262515511).

Almost surely, 2^40525031021 is an apocalyptic number.

It is an amenable number.

40525031021 is a deficient number, since it is larger than the sum of its proper divisors (1).

40525031021 is an equidigital number, since it uses as much as digits as its factorization.

40525031021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 40525031021 its reverse (12013052504), we get a palindrome (52538083525).

The spelling of 40525031021 in words is "forty billion, five hundred twenty-five million, thirty-one thousand, twenty-one".