21122069 has 2 divisors, whose sum is σ = 21122070. Its totient is φ = 21122068.

The previous prime is 21122033. The next prime is 21122099. The reversal of 21122069 is 96022112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20884900 + 237169 = 4570^2 + 487^2 .

It is a cyclic number.

It is not a de Polignac number, because 21122069 - 2⁸ = 21121813 is a prime.

It is a super-2 number, since 2×21122069² = 892283597681522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21122009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561034 + 10561035.

It is an arithmetic number, because the mean of its divisors is an integer number (10561035).

Almost surely, 2^21122069 is an apocalyptic number.

It is an amenable number.

21122069 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122069 is an equidigital number, since it uses as much as digits as its factorization.

21122069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 21122069 is about 4595.8752158865. The cubic root of 21122069 is about 276.4259552098.

The spelling of 21122069 in words is "twenty-one million, one hundred twenty-two thousand, sixty-nine".