21042310124021 has 8 divisors (see below), whose sum is σ = 22070830172160. Its totient is φ = 20037990547728.

The previous prime is 21042310123999. The next prime is 21042310124027. The reversal of 21042310124021 is 12042101324012.

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 21042310124021 - 2³⁰ = 21041236382197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21042310124027) 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, 6050116181 + ... + 6050119658.

It is an arithmetic number, because the mean of its divisors is an integer number (2758853771520).

Almost surely, 2^{21042310124021} is an apocalyptic number.

It is an amenable number.

21042310124021 is a deficient number, since it is larger than the sum of its proper divisors (1028520048139).

21042310124021 is a wasteful number, since it uses less digits than its factorization.

21042310124021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12100235923.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 21042310124021 its reverse (12042101324012), we get a palindrome (33084411448033).

The spelling of 21042310124021 in words is "twenty-one trillion, forty-two billion, three hundred ten million, one hundred twenty-four thousand, twenty-one".