121899036672 has 416 divisors, whose sum is σ = 420658306560. Its totient is φ = 34159656960.

The previous prime is 121899036667. The next prime is 121899036689. The reversal of 121899036672 is 276630998121.

121899036672 is a `hidden beast` number, since 12 + 189 + 90 + 366 + 7 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41028147 + ... + 41031117.

Almost surely, 2^121899036672 is an apocalyptic number.

121899036672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121899036672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210329153280).

121899036672 is an abundant number, since it is smaller than the sum of its proper divisors (298759269888).

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

121899036672 is an equidigital number, since it uses as much as digits as its factorization.

121899036672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3064 (or 3036 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The spelling of 121899036672 in words is "one hundred twenty-one billion, eight hundred ninety-nine million, thirty-six thousand, six hundred seventy-two".