21231320123021 has 8 divisors (see below), whose sum is σ = 21961203899904. Its totient is φ = 20504249001360.

The previous prime is 21231320122997. The next prime is 21231320123023. The reversal of 21231320123021 is 12032102313212.

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 21231320123021 - 2¹⁰ = 21231320121997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231320123023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 703148450 + ... + 703178643.

It is an arithmetic number, because the mean of its divisors is an integer number (2745150487488).

Almost surely, 2^{21231320123021} is an apocalyptic number.

It is an amenable number.

21231320123021 is a deficient number, since it is larger than the sum of its proper divisors (729883776883).

21231320123021 is a wasteful number, since it uses less digits than its factorization.

21231320123021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406327611.

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

Adding to 21231320123021 its reverse (12032102313212), we get a palindrome (33263422436233).

The spelling of 21231320123021 in words is "twenty-one trillion, two hundred thirty-one billion, three hundred twenty million, one hundred twenty-three thousand, twenty-one".