121996290 has 64 divisors (see below), whose sum is σ = 318479616. Its totient is φ = 29728512.

The previous prime is 121996271. The next prime is 121996307. The reversal of 121996290 is 92699121.

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 38652 + ... + 41688.

It is an arithmetic number, because the mean of its divisors is an integer number (4976244).

Almost surely, 2^121996290 is an apocalyptic number.

121996290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121996290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159239808).

121996290 is an abundant number, since it is smaller than the sum of its proper divisors (196483326).

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

121996290 is a wasteful number, since it uses less digits than its factorization.

121996290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3163.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 121996290 is about 11045.1930721015. The cubic root of 121996290 is about 495.9625389025.

The spelling of 121996290 in words is "one hundred twenty-one million, nine hundred ninety-six thousand, two hundred ninety".