21123230202021 has 8 divisors (see below), whose sum is σ = 28164420633024. Its totient is φ = 14082096619520.

The previous prime is 21123230201987. The next prime is 21123230202029. The reversal of 21123230202021 is 12020203232112.

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

It is a cyclic number.

It is not a de Polignac number, because 21123230202021 - 2¹⁰ = 21123230200997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123230202029) 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, 13337436 + ... + 14836901.

It is an arithmetic number, because the mean of its divisors is an integer number (3520552579128).

Almost surely, 2^{21123230202021} is an apocalyptic number.

It is an amenable number.

21123230202021 is a deficient number, since it is larger than the sum of its proper divisors (7041190431003).

21123230202021 is a wasteful number, since it uses less digits than its factorization.

21123230202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28424251.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21123230202021 its reverse (12020203232112), we get a palindrome (33143433434133).

The spelling of 21123230202021 in words is "twenty-one trillion, one hundred twenty-three billion, two hundred thirty million, two hundred two thousand, twenty-one".