121967816 has 24 divisors (see below), whose sum is σ = 232330770. Its totient is φ = 60016896.

The previous prime is 121967803. The next prime is 121967819. The reversal of 121967816 is 618769121.

It can be written as a sum of positive squares in 3 ways, for example, as 121660900 + 306916 = 11030^2 + 554^2 .

It is a super-2 number, since 2×121967816² = 29752296279619712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121967819) 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 in 5 ways as a sum of consecutive naturals, for example, 266660 + ... + 267116.

Almost surely, 2^121967816 is an apocalyptic number.

It is an amenable number.

121967816 is a deficient number, since it is larger than the sum of its proper divisors (110362954).

121967816 is an frugal number, since it uses more digits than its factorization.

121967816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993 (or 532 counting only the distinct ones).

The product of its digits is 36288, while the sum is 41.

The square root of 121967816 is about 11043.9040198654. The cubic root of 121967816 is about 495.9239499252.

The spelling of 121967816 in words is "one hundred twenty-one million, nine hundred sixty-seven thousand, eight hundred sixteen".