421326623129 has 2 divisors, whose sum is σ = 421326623130. Its totient is φ = 421326623128.

The previous prime is 421326623099. The next prime is 421326623143. The reversal of 421326623129 is 921326623124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 399458128729 + 21868494400 = 632027^2 + 147880^2 .

It is a cyclic number.

It is not a de Polignac number, because 421326623129 - 2¹⁶ = 421326557593 is a prime.

It is a super-2 number, since 2×421326623129² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (421326623329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210663311564 + 210663311565.

It is an arithmetic number, because the mean of its divisors is an integer number (210663311565).

Almost surely, 2^421326623129 is an apocalyptic number.

It is an amenable number.

421326623129 is a deficient number, since it is larger than the sum of its proper divisors (1).

421326623129 is an equidigital number, since it uses as much as digits as its factorization.

421326623129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 41.

The spelling of 421326623129 in words is "four hundred twenty-one billion, three hundred twenty-six million, six hundred twenty-three thousand, one hundred twenty-nine".