20092021 has 2 divisors, whose sum is σ = 20092022. Its totient is φ = 20092020.

The previous prime is 20092019. The next prime is 20092043. The reversal of 20092021 is 12029002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15295921 + 4796100 = 3911^2 + 2190^2 .

It is a cyclic number.

It is not a de Polignac number, because 20092021 - 2¹ = 20092019 is a prime.

Together with 20092019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20091986 and 20092004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20092001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10046010 + 10046011.

It is an arithmetic number, because the mean of its divisors is an integer number (10046011).

Almost surely, 2^20092021 is an apocalyptic number.

It is an amenable number.

20092021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20092021 is an equidigital number, since it uses as much as digits as its factorization.

20092021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 20092021 is about 4482.4124085140. The cubic root of 20092021 is about 271.8574305113.

The spelling of 20092021 in words is "twenty million, ninety-two thousand, twenty-one".