421021240391 has 16 divisors (see below), whose sum is σ = 443251299744. Its totient is φ = 399396541824.

The previous prime is 421021240309. The next prime is 421021240399. The reversal of 421021240391 is 193042120124.

It is a cyclic number.

It is not a de Polignac number, because 421021240391 - 2¹⁰ = 421021239367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421021240399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 648641 + ... + 1123733.

It is an arithmetic number, because the mean of its divisors is an integer number (27703206234).

Almost surely, 2^421021240391 is an apocalyptic number.

421021240391 is a deficient number, since it is larger than the sum of its proper divisors (22230059353).

421021240391 is a wasteful number, since it uses less digits than its factorization.

421021240391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475730.

The product of its (nonzero) digits is 3456, while the sum is 29.

The spelling of 421021240391 in words is "four hundred twenty-one billion, twenty-one million, two hundred forty thousand, three hundred ninety-one".