21021210210023 has 8 divisors (see below), whose sum is σ = 22102572636480. Its totient is φ = 19963613990880.

The previous prime is 21021210210001. The next prime is 21021210210047. The reversal of 21021210210023 is 32001201212012.

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 21021210210023 - 2⁶ = 21021210209959 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21021210209983 and 21021210210010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021210218023) 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, 5941550015 + ... + 5941553552.

It is an arithmetic number, because the mean of its divisors is an integer number (2762821579560).

Almost surely, 2^{21021210210023} is an apocalyptic number.

21021210210023 is a deficient number, since it is larger than the sum of its proper divisors (1081362426457).

21021210210023 is a wasteful number, since it uses less digits than its factorization.

21021210210023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11883103657.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21021210210023 its reverse (32001201212012), we get a palindrome (53022411422035).

The spelling of 21021210210023 in words is "twenty-one trillion, twenty-one billion, two hundred ten million, two hundred ten thousand, twenty-three".