21011202023 has 4 divisors (see below), whose sum is σ = 24012802320. Its totient is φ = 18009601728.

The previous prime is 21011202019. The next prime is 21011202067. The reversal of 21011202023 is 32020211012.

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 21011202023 - 2² = 21011202019 is a prime.

It is a super-2 number, since 2×21011202023² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21011201989 and 21011202007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011202013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1500800138 + ... + 1500800151.

It is an arithmetic number, because the mean of its divisors is an integer number (6003200580).

Almost surely, 2^21011202023 is an apocalyptic number.

21011202023 is a deficient number, since it is larger than the sum of its proper divisors (3001600297).

21011202023 is an equidigital number, since it uses as much as digits as its factorization.

21011202023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3001600296.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21011202023 its reverse (32020211012), we get a palindrome (53031413035).

The spelling of 21011202023 in words is "twenty-one billion, eleven million, two hundred two thousand, twenty-three".