21010121210023 has 8 divisors (see below), whose sum is σ = 22920741724176. Its totient is φ = 19099602278400.

The previous prime is 21010121209991. The next prime is 21010121210041. The reversal of 21010121210023 is 32001212101012.

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 21010121210023 - 2⁵ = 21010121209991 is a prime.

It is a super-3 number, since 3×21010121210023³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21010121209979 and 21010121210006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010121214023) 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, 24962848 + ... + 25790773.

It is an arithmetic number, because the mean of its divisors is an integer number (2865092715522).

Almost surely, 2^{21010121210023} is an apocalyptic number.

21010121210023 is a deficient number, since it is larger than the sum of its proper divisors (1910620514153).

21010121210023 is a wasteful number, since it uses less digits than its factorization.

21010121210023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50791265.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21010121210023 its reverse (32001212101012), we get a palindrome (53011333311035).

The spelling of 21010121210023 in words is "twenty-one trillion, ten billion, one hundred twenty-one million, two hundred ten thousand, twenty-three".