221211020112123 has 16 divisors (see below), whose sum is σ = 297099202803200. Its totient is φ = 146398634327520.

The previous prime is 221211020112067. The next prime is 221211020112143. The reversal of 221211020112123 is 321211020112122.

It is not a de Polignac number, because 221211020112123 - 2¹⁷ = 221211019981051 is a prime.

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 221211020112123.

It is not an unprimeable number, because it can be changed into a prime (221211020112143) 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, 21872668 + ... + 30345273.

It is an arithmetic number, because the mean of its divisors is an integer number (18568700175200).

Almost surely, 2^{221211020112123} is an apocalyptic number.

221211020112123 is a deficient number, since it is larger than the sum of its proper divisors (75888182691077).

221211020112123 is a wasteful number, since it uses less digits than its factorization.

221211020112123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52228242.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 221211020112123 its reverse (321211020112122), we get a palindrome (542422040224245).

Subtracting 221211020112123 from its reverse (321211020112122), we obtain a palindrome (99999999999999).

The spelling of 221211020112123 in words is "two hundred twenty-one trillion, two hundred eleven billion, twenty million, one hundred twelve thousand, one hundred twenty-three".