40031021221 has 2 divisors, whose sum is σ = 40031021222. Its totient is φ = 40031021220.

The previous prime is 40031021179. The next prime is 40031021231. The reversal of 40031021221 is 12212013004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28387532196 + 11643489025 = 168486^2 + 107905^2 .

It is a cyclic number.

It is not a de Polignac number, because 40031021221 - 2¹¹ = 40031019173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40031021195 and 40031021204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40031021231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20015510610 + 20015510611.

It is an arithmetic number, because the mean of its divisors is an integer number (20015510611).

Almost surely, 2^40031021221 is an apocalyptic number.

It is an amenable number.

40031021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

40031021221 is an equidigital number, since it uses as much as digits as its factorization.

40031021221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 40031021221 its reverse (12212013004), we get a palindrome (52243034225).

The spelling of 40031021221 in words is "forty billion, thirty-one million, twenty-one thousand, two hundred twenty-one".