21101130121123 has 16 divisors (see below), whose sum is σ = 22846414348800. Its totient is φ = 19373319745920.

The previous prime is 21101130121087. The next prime is 21101130121187. The reversal of 21101130121123 is 32112103110112.

It is a cyclic number.

It is not a de Polignac number, because 21101130121123 - 2⁹ = 21101130120611 is a prime.

It is a super-2 number, since 2×21101130121123² (a number of 27 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 21101130121123.

It is not an unprimeable number, because it can be changed into a prime (21101130121523) 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, 17566893 + ... + 18729601.

It is an arithmetic number, because the mean of its divisors is an integer number (1427900896800).

Almost surely, 2^{21101130121123} is an apocalyptic number.

21101130121123 is a deficient number, since it is larger than the sum of its proper divisors (1745284227677).

21101130121123 is a wasteful number, since it uses less digits than its factorization.

21101130121123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170222.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 21101130121123 its reverse (32112103110112), we get a palindrome (53213233231235).

The spelling of 21101130121123 in words is "twenty-one trillion, one hundred one billion, one hundred thirty million, one hundred twenty-one thousand, one hundred twenty-three".