21010323311021 has 4 divisors (see below), whose sum is σ = 22920352702944. Its totient is φ = 19100293919100.

The previous prime is 21010323311009. The next prime is 21010323311051. The reversal of 21010323311021 is 12011332301012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21010323311021 - 2²⁶ = 21010256202157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21010323310984 and 21010323311002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010323311051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 955014695945 + ... + 955014695966.

It is an arithmetic number, because the mean of its divisors is an integer number (5730088175736).

Almost surely, 2^{21010323311021} is an apocalyptic number.

It is an amenable number.

21010323311021 is a deficient number, since it is larger than the sum of its proper divisors (1910029391923).

21010323311021 is a wasteful number, since it uses less digits than its factorization.

21010323311021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1910029391922.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21010323311021 its reverse (12011332301012), we get a palindrome (33021655612033).

The spelling of 21010323311021 in words is "twenty-one trillion, ten billion, three hundred twenty-three million, three hundred eleven thousand, twenty-one".