20914121 has 2 divisors, whose sum is σ = 20914122. Its totient is φ = 20914120.

The previous prime is 20914099. The next prime is 20914123. The reversal of 20914121 is 12141902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11526025 + 9388096 = 3395^2 + 3064^2 .

It is a cyclic number.

It is not a de Polignac number, because 20914121 - 2²² = 16719817 is a prime.

Together with 20914123, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20914093 and 20914102.

It is not a weakly prime, because it can be changed into another prime (20914123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10457060 + 10457061.

It is an arithmetic number, because the mean of its divisors is an integer number (10457061).

Almost surely, 2^20914121 is an apocalyptic number.

It is an amenable number.

20914121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20914121 is an equidigital number, since it uses as much as digits as its factorization.

20914121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 20914121 is about 4573.1959284509. The cubic root of 20914121 is about 275.5158186487.

The spelling of 20914121 in words is "twenty million, nine hundred fourteen thousand, one hundred twenty-one".