40420668221 has 2 divisors, whose sum is σ = 40420668222. Its totient is φ = 40420668220.

The previous prime is 40420668203. The next prime is 40420668247. The reversal of 40420668221 is 12286602404.

40420668221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39628864900 + 791803321 = 199070^2 + 28139^2 .

It is a cyclic number.

It is not a de Polignac number, because 40420668221 - 2²⁶ = 40353559357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40420638221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20210334110 + 20210334111.

It is an arithmetic number, because the mean of its divisors is an integer number (20210334111).

Almost surely, 2^40420668221 is an apocalyptic number.

It is an amenable number.

40420668221 is a deficient number, since it is larger than the sum of its proper divisors (1).

40420668221 is an equidigital number, since it uses as much as digits as its factorization.

40420668221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36864, while the sum is 35.

The spelling of 40420668221 in words is "forty billion, four hundred twenty million, six hundred sixty-eight thousand, two hundred twenty-one".