21202323231021 has 8 divisors (see below), whose sum is σ = 28733203067424. Its totient is φ = 13903162774320.

The previous prime is 21202323230969. The next prime is 21202323231041. The reversal of 21202323231021 is 12013232320212.

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

It is not a de Polignac number, because 21202323231021 - 2⁹ = 21202323230509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21202323230982 and 21202323231000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202323231041) 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, 57929844711 + ... + 57929845076.

It is an arithmetic number, because the mean of its divisors is an integer number (3591650383428).

Almost surely, 2^{21202323231021} is an apocalyptic number.

It is an amenable number.

21202323231021 is a deficient number, since it is larger than the sum of its proper divisors (7530879836403).

21202323231021 is a wasteful number, since it uses less digits than its factorization.

21202323231021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115859689851.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21202323231021 its reverse (12013232320212), we get a palindrome (33215555551233).

The spelling of 21202323231021 in words is "twenty-one trillion, two hundred two billion, three hundred twenty-three million, two hundred thirty-one thousand, twenty-one".