421213616291 has 4 divisors (see below), whose sum is σ = 453614663712. Its totient is φ = 388812568872.

The previous prime is 421213616273. The next prime is 421213616363. The reversal of 421213616291 is 192616312124.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-421213616291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421213616261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16200523691 + ... + 16200523716.

It is an arithmetic number, because the mean of its divisors is an integer number (113403665928).

Almost surely, 2^421213616291 is an apocalyptic number.

421213616291 is a deficient number, since it is larger than the sum of its proper divisors (32401047421).

421213616291 is a wasteful number, since it uses less digits than its factorization.

421213616291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32401047420.

The product of its digits is 31104, while the sum is 38.

The spelling of 421213616291 in words is "four hundred twenty-one billion, two hundred thirteen million, six hundred sixteen thousand, two hundred ninety-one".