121719816 has 48 divisors (see below), whose sum is σ = 337706460. Its totient is φ = 39582720.

The previous prime is 121719791. The next prime is 121719823. The reversal of 121719816 is 618917121.

It can be written as a sum of positive squares in 2 ways, for example, as 108368100 + 13351716 = 10410^2 + 3654^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17665 + ... + 23568.

Almost surely, 2^121719816 is an apocalyptic number.

It is an amenable number.

121719816 is an abundant number, since it is smaller than the sum of its proper divisors (215986644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121719816 is a wasteful number, since it uses less digits than its factorization.

121719816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41286 (or 41279 counting only the distinct ones).

The product of its digits is 6048, while the sum is 36.

The square root of 121719816 is about 11032.6703929738. The cubic root of 121719816 is about 495.5875972796.

The spelling of 121719816 in words is "one hundred twenty-one million, seven hundred nineteen thousand, eight hundred sixteen".