221012121010110 has 16 divisors (see below), whose sum is σ = 530429090424336. Its totient is φ = 58936565602688.

The previous prime is 221012121010097. The next prime is 221012121010123. The reversal of 221012121010110 is 11010121210122.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (221012121010097) and next prime (221012121010123).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221012121010110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3683535350139 + ... + 3683535350198.

It is an arithmetic number, because the mean of its divisors is an integer number (33151818151521).

Almost surely, 2^{221012121010110} is an apocalyptic number.

221012121010110 is an abundant number, since it is smaller than the sum of its proper divisors (309416969414226).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221012121010110 is a wasteful number, since it uses less digits than its factorization.

221012121010110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7367070700347.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221012121010110 its reverse (11010121210122), we get a palindrome (232022242220232).

The spelling of 221012121010110 in words is "two hundred twenty-one trillion, twelve billion, one hundred twenty-one million, ten thousand, one hundred ten".