20221379 has 2 divisors, whose sum is σ = 20221380. Its totient is φ = 20221378.

The previous prime is 20221343. The next prime is 20221391. The reversal of 20221379 is 97312202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20221379 - 2¹² = 20217283 is a prime.

It is not a weakly prime, because it can be changed into another prime (20221319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110689 + 10110690.

It is an arithmetic number, because the mean of its divisors is an integer number (10110690).

Almost surely, 2^20221379 is an apocalyptic number.

20221379 is a deficient number, since it is larger than the sum of its proper divisors (1).

20221379 is an equidigital number, since it uses as much as digits as its factorization.

20221379 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 20221379 is about 4496.8187644156. The cubic root of 20221379 is about 272.4396140358.

The spelling of 20221379 in words is "twenty million, two hundred twenty-one thousand, three hundred seventy-nine".