221210101012123 has 4 divisors (see below), whose sum is σ = 221235150290688. Its totient is φ = 221185051733560.

The previous prime is 221210101012097. The next prime is 221210101012177. The reversal of 221210101012123 is 321210101012122.

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 221210101012123 - 2³³ = 221201511077531 is a prime.

It is a super-2 number, since 2×221210101012123² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221210101012123.

It is not an unprimeable number, because it can be changed into a prime (221210101082123) 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, 12524626036 + ... + 12524643697.

It is an arithmetic number, because the mean of its divisors is an integer number (55308787572672).

Almost surely, 2^{221210101012123} is an apocalyptic number.

221210101012123 is a deficient number, since it is larger than the sum of its proper divisors (25049278565).

221210101012123 is an equidigital number, since it uses as much as digits as its factorization.

221210101012123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25049278564.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 221210101012123 its reverse (321210101012122), we get a palindrome (542420202024245).

Subtracting 221210101012123 from its reverse (321210101012122), we obtain a palindrome (99999999999999).

The spelling of 221210101012123 in words is "two hundred twenty-one trillion, two hundred ten billion, one hundred one million, twelve thousand, one hundred twenty-three".