221010344121 has 16 divisors (see below), whose sum is σ = 348390691200. Its totient is φ = 121936741248.

The previous prime is 221010344119. The next prime is 221010344123. The reversal of 221010344121 is 121443010122.

It is an interprime number because it is at equal distance from previous prime (221010344119) and next prime (221010344123).

It is not a de Polignac number, because 221010344121 - 2¹ = 221010344119 is a prime.

It is a super-4 number, since 4×221010344121⁴ (a number of 46 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (221010344123) 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, 181452876 + ... + 181454093.

It is an arithmetic number, because the mean of its divisors is an integer number (21774418200).

Almost surely, 2^221010344121 is an apocalyptic number.

221010344121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221010344121 is a deficient number, since it is larger than the sum of its proper divisors (127380347079).

221010344121 is a wasteful number, since it uses less digits than its factorization.

221010344121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362907008.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 221010344121 its reverse (121443010122), we get a palindrome (342453354243).

The spelling of 221010344121 in words is "two hundred twenty-one billion, ten million, three hundred forty-four thousand, one hundred twenty-one".