20021100023 has 2 divisors, whose sum is σ = 20021100024. Its totient is φ = 20021100022.

The previous prime is 20021100019. The next prime is 20021100031. The reversal of 20021100023 is 32000112002.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20021100023 - 2² = 20021100019 is a prime.

It is a super-2 number, since 2×20021100023² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20021099977 and 20021100013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021100083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010550011 + 10010550012.

It is an arithmetic number, because the mean of its divisors is an integer number (10010550012).

Almost surely, 2^20021100023 is an apocalyptic number.

20021100023 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021100023 is an equidigital number, since it uses as much as digits as its factorization.

20021100023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 20021100023 its reverse (32000112002), we get a palindrome (52021212025).

The spelling of 20021100023 in words is "twenty billion, twenty-one million, one hundred thousand, twenty-three".