21021022023 has 8 divisors (see below), whose sum is σ = 28033985136. Its totient is φ = 14011036800.

The previous prime is 21021021979. The next prime is 21021022049. The reversal of 21021022023 is 32022012012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21021022023 - 2²⁸ = 20752586567 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21021021993 and 21021022011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021022423) 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, 727948 + ... + 756273.

It is an arithmetic number, because the mean of its divisors is an integer number (3504248142).

Almost surely, 2^21021022023 is an apocalyptic number.

21021022023 is a deficient number, since it is larger than the sum of its proper divisors (7012963113).

21021022023 is a wasteful number, since it uses less digits than its factorization.

21021022023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1488945.

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

Adding to 21021022023 its reverse (32022012012), we get a palindrome (53043034035).

The spelling of 21021022023 in words is "twenty-one billion, twenty-one million, twenty-two thousand, twenty-three".