21221121120123 has 32 divisors (see below), whose sum is σ = 29019510374400. Its totient is φ = 13785902208000.

The previous prime is 21221121120037. The next prime is 21221121120139. The reversal of 21221121120123 is 32102112112212.

It is not a de Polignac number, because 21221121120123 - 2³² = 21216826152827 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21221121120123.

It is not an unprimeable number, because it can be changed into a prime (21221121120193) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 640118598 + ... + 640151748.

It is an arithmetic number, because the mean of its divisors is an integer number (906859699200).

Almost surely, 2^{21221121120123} is an apocalyptic number.

21221121120123 is a deficient number, since it is larger than the sum of its proper divisors (7798389254277).

21221121120123 is a wasteful number, since it uses less digits than its factorization.

21221121120123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39243.

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

Adding to 21221121120123 its reverse (32102112112212), we get a palindrome (53323233232335).

The spelling of 21221121120123 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred twenty thousand, one hundred twenty-three".