21002012020023 has 4 divisors (see below), whose sum is σ = 28002682693368. Its totient is φ = 14001341346680.

The previous prime is 21002012020007. The next prime is 21002012020111. The reversal of 21002012020023 is 32002021020012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21002012020023 - 2⁴ = 21002012020007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21002012019984 and 21002012020011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002012025023) 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, 3500335336668 + ... + 3500335336673.

It is an arithmetic number, because the mean of its divisors is an integer number (7000670673342).

Almost surely, 2^{21002012020023} is an apocalyptic number.

21002012020023 is a deficient number, since it is larger than the sum of its proper divisors (7000670673345).

21002012020023 is an equidigital number, since it uses as much as digits as its factorization.

21002012020023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7000670673344.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21002012020023 its reverse (32002021020012), we get a palindrome (53004033040035).

The spelling of 21002012020023 in words is "twenty-one trillion, two billion, twelve million, twenty thousand, twenty-three".