21213301022123 has 16 divisors (see below), whose sum is σ = 24252422388480. Its totient is φ = 18176343151200.

The previous prime is 21213301022071. The next prime is 21213301022161. The reversal of 21213301022123 is 32122010331212.

It is a cyclic number.

It is not a de Polignac number, because 21213301022123 - 2⁸ = 21213301021867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213301022723) 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, 290314013 + ... + 290387073.

It is an arithmetic number, because the mean of its divisors is an integer number (1515776399280).

Almost surely, 2^{21213301022123} is an apocalyptic number.

21213301022123 is a deficient number, since it is larger than the sum of its proper divisors (3039121366357).

21213301022123 is a wasteful number, since it uses less digits than its factorization.

21213301022123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87298.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21213301022123 its reverse (32122010331212), we get a palindrome (53335311353335).

The spelling of 21213301022123 in words is "twenty-one trillion, two hundred thirteen billion, three hundred one million, twenty-two thousand, one hundred twenty-three".