90407070821 has 2 divisors, whose sum is σ = 90407070822. Its totient is φ = 90407070820.

The previous prime is 90407070781. The next prime is 90407070827. The reversal of 90407070821 is 12807070409.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61908904225 + 28498166596 = 248815^2 + 168814^2 .

It is a cyclic number.

It is not a de Polignac number, because 90407070821 - 2⁶ = 90407070757 is a prime.

It is a super-2 number, since 2×90407070821² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90407070827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45203535410 + 45203535411.

It is an arithmetic number, because the mean of its divisors is an integer number (45203535411).

Almost surely, 2^90407070821 is an apocalyptic number.

It is an amenable number.

90407070821 is a deficient number, since it is larger than the sum of its proper divisors (1).

90407070821 is an equidigital number, since it uses as much as digits as its factorization.

90407070821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 38.

The spelling of 90407070821 in words is "ninety billion, four hundred seven million, seventy thousand, eight hundred twenty-one".