221121120021123 has 16 divisors (see below), whose sum is σ = 336949526370816. Its totient is φ = 126353779063680.

The previous prime is 221121120021101. The next prime is 221121120021181. The reversal of 221121120021123 is 321120021121122.

It is not a de Polignac number, because 221121120021123 - 2⁹ = 221121120020611 is a prime.

It is a super-2 number, since 2×221121120021123² (a number of 29 digits) contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 221121120021123.

It is not an unprimeable number, because it can be changed into a prime (221121120020123) 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, 45405711 + ... + 50039192.

It is an arithmetic number, because the mean of its divisors is an integer number (21059345398176).

Almost surely, 2^{221121120021123} is an apocalyptic number.

221121120021123 is a deficient number, since it is larger than the sum of its proper divisors (115828406349693).

221121120021123 is a wasteful number, since it uses less digits than its factorization.

221121120021123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95555234.

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

Adding to 221121120021123 its reverse (321120021121122), we get a palindrome (542241141142245).

The spelling of 221121120021123 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, one hundred twenty million, twenty-one thousand, one hundred twenty-three".