21021132122123 has 8 divisors (see below), whose sum is σ = 24024288193248. Its totient is φ = 18018010350144.

The previous prime is 21021132122069. The next prime is 21021132122149. The reversal of 21021132122123 is 32122123112012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21021132122123 - 2¹⁸ = 21021131859979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21021132124123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7247786 + ... + 9724847.

It is an arithmetic number, because the mean of its divisors is an integer number (3003036024156).

Almost surely, 2^{21021132122123} is an apocalyptic number.

21021132122123 is a deficient number, since it is larger than the sum of its proper divisors (3003156071125).

21021132122123 is a wasteful number, since it uses less digits than its factorization.

21021132122123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17149573.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21021132122123 its reverse (32122123112012), we get a palindrome (53143255234135).

The spelling of 21021132122123 in words is "twenty-one trillion, twenty-one billion, one hundred thirty-two million, one hundred twenty-two thousand, one hundred twenty-three".