21116969 has 2 divisors, whose sum is σ = 21116970. Its totient is φ = 21116968.

The previous prime is 21116951. The next prime is 21116987. The reversal of 21116969 is 96961112.

It is a balanced prime because it is at equal distance from previous prime (21116951) and next prime (21116987).

It can be written as a sum of positive squares in only one way, i.e., 19465744 + 1651225 = 4412^2 + 1285^2 .

It is a cyclic number.

It is not a de Polignac number, because 21116969 - 2⁸ = 21116713 is a prime.

It is a super-2 number, since 2×21116969² = 891852759493922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21112969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10558484 + 10558485.

It is an arithmetic number, because the mean of its divisors is an integer number (10558485).

Almost surely, 2^21116969 is an apocalyptic number.

It is an amenable number.

21116969 is a deficient number, since it is larger than the sum of its proper divisors (1).

21116969 is an equidigital number, since it uses as much as digits as its factorization.

21116969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 35.

The square root of 21116969 is about 4595.3203370385. The cubic root of 21116969 is about 276.4037054032.

The spelling of 21116969 in words is "twenty-one million, one hundred sixteen thousand, nine hundred sixty-nine".