421561223611 has 4 divisors (see below), whose sum is σ = 459884971224. Its totient is φ = 383237476000.

The previous prime is 421561223563. The next prime is 421561223623. The reversal of 421561223611 is 116322165124.

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

It is a cyclic number.

It is not a de Polignac number, because 421561223611 - 2¹³ = 421561215419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421561223011) 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, 19161873790 + ... + 19161873811.

It is an arithmetic number, because the mean of its divisors is an integer number (114971242806).

Almost surely, 2^421561223611 is an apocalyptic number.

421561223611 is a deficient number, since it is larger than the sum of its proper divisors (38323747613).

421561223611 is a wasteful number, since it uses less digits than its factorization.

421561223611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38323747612.

The product of its digits is 17280, while the sum is 34.

Adding to 421561223611 its reverse (116322165124), we get a palindrome (537883388735).

The spelling of 421561223611 in words is "four hundred twenty-one billion, five hundred sixty-one million, two hundred twenty-three thousand, six hundred eleven".