216121069 has 2 divisors, whose sum is σ = 216121070. Its totient is φ = 216121068.

The previous prime is 216121043. The next prime is 216121097. The reversal of 216121069 is 960121612.

It is an a-pointer prime, because the next prime (216121097) can be obtained adding 216121069 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212080969 + 4040100 = 14563^2 + 2010^2 .

It is a cyclic number.

It is not a de Polignac number, because 216121069 - 2⁷ = 216120941 is a prime.

It is a super-2 number, since 2×216121069² = 93416632931405522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216121469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108060534 + 108060535.

It is an arithmetic number, because the mean of its divisors is an integer number (108060535).

Almost surely, 2^216121069 is an apocalyptic number.

It is an amenable number.

216121069 is a deficient number, since it is larger than the sum of its proper divisors (1).

216121069 is an equidigital number, since it uses as much as digits as its factorization.

216121069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 216121069 is about 14701.0567307252. The cubic root of 216121069 is about 600.1120799881.

The spelling of 216121069 in words is "two hundred sixteen million, one hundred twenty-one thousand, sixty-nine".