21201079 has 2 divisors, whose sum is σ = 21201080. Its totient is φ = 21201078.

The previous prime is 21201067. The next prime is 21201083. The reversal of 21201079 is 97010212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21201079 - 2¹³ = 21192887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21201379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600539 + 10600540.

It is an arithmetic number, because the mean of its divisors is an integer number (10600540).

Almost surely, 2^21201079 is an apocalyptic number.

21201079 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201079 is an equidigital number, since it uses as much as digits as its factorization.

21201079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 21201079 is about 4604.4629437102. The cubic root of 21201079 is about 276.7701960891.

The spelling of 21201079 in words is "twenty-one million, two hundred one thousand, seventy-nine".