421356657929 has 2 divisors, whose sum is σ = 421356657930. Its totient is φ = 421356657928.

The previous prime is 421356657881. The next prime is 421356657959. The reversal of 421356657929 is 929756653124.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 301893104704 + 119463553225 = 549448^2 + 345635^2 .

It is a cyclic number.

It is not a de Polignac number, because 421356657929 - 2¹² = 421356653833 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (421356657959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210678328964 + 210678328965.

It is an arithmetic number, because the mean of its divisors is an integer number (210678328965).

Almost surely, 2^421356657929 is an apocalyptic number.

It is an amenable number.

421356657929 is a deficient number, since it is larger than the sum of its proper divisors (1).

421356657929 is an equidigital number, since it uses as much as digits as its factorization.

421356657929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24494400, while the sum is 59.

The spelling of 421356657929 in words is "four hundred twenty-one billion, three hundred fifty-six million, six hundred fifty-seven thousand, nine hundred twenty-nine".