221434130021 has 16 divisors (see below), whose sum is σ = 239478180480. Its totient is φ = 203535140160.

The previous prime is 221434130011. The next prime is 221434130059. The reversal of 221434130021 is 120031434122.

It is a cyclic number.

It is not a de Polignac number, because 221434130021 - 2³⁰ = 220360388197 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 (221434130011) 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, 8640695 + ... + 8666283.

It is an arithmetic number, because the mean of its divisors is an integer number (14967386280).

Almost surely, 2^221434130021 is an apocalyptic number.

It is an amenable number.

221434130021 is a deficient number, since it is larger than the sum of its proper divisors (18044050459).

221434130021 is a wasteful number, since it uses less digits than its factorization.

221434130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28396.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 221434130021 its reverse (120031434122), we get a palindrome (341465564143).

The spelling of 221434130021 in words is "two hundred twenty-one billion, four hundred thirty-four million, one hundred thirty thousand, twenty-one".