21432722364877 has 2 divisors, whose sum is σ = 21432722364878. Its totient is φ = 21432722364876.

The previous prime is 21432722364871. The next prime is 21432722364931. The reversal of 21432722364877 is 77846322723412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19934671210276 + 1498051154601 = 4464826^2 + 1223949^2 .

It is a cyclic number.

It is not a de Polignac number, because 21432722364877 - 2¹¹ = 21432722362829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21432722364871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716361182438 + 10716361182439.

It is an arithmetic number, because the mean of its divisors is an integer number (10716361182439).

Almost surely, 2^{21432722364877} is an apocalyptic number.

It is an amenable number.

21432722364877 is a deficient number, since it is larger than the sum of its proper divisors (1).

21432722364877 is an equidigital number, since it uses as much as digits as its factorization.

21432722364877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37933056, while the sum is 58.

The spelling of 21432722364877 in words is "twenty-one trillion, four hundred thirty-two billion, seven hundred twenty-two million, three hundred sixty-four thousand, eight hundred seventy-seven".