21021111330123 has 32 divisors (see below), whose sum is σ = 28598918400000. Its totient is φ = 13731746700672.

The previous prime is 21021111330103. The next prime is 21021111330169. The reversal of 21021111330123 is 32103311112012.

It is not a de Polignac number, because 21021111330123 - 2⁶ = 21021111330059 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21021111330123.

It is not an unprimeable number, because it can be changed into a prime (21021111330103) 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, 17773513 + ... + 18919301.

It is an arithmetic number, because the mean of its divisors is an integer number (893716200000).

Almost surely, 2^{21021111330123} is an apocalyptic number.

21021111330123 is a deficient number, since it is larger than the sum of its proper divisors (7577807069877).

21021111330123 is a wasteful number, since it uses less digits than its factorization.

21021111330123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1146459.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 21021111330123 its reverse (32103311112012), we get a palindrome (53124422442135).

The spelling of 21021111330123 in words is "twenty-one trillion, twenty-one billion, one hundred eleven million, three hundred thirty thousand, one hundred twenty-three".