121973620 has 24 divisors (see below), whose sum is σ = 258789384. Its totient is φ = 48285696.

The previous prime is 121973609. The next prime is 121973633. The reversal of 121973620 is 26379121.

It can be written as a sum of positive squares in 4 ways, for example, as 32330596 + 89643024 = 5686^2 + 9468^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29497 + ... + 33376.

It is an arithmetic number, because the mean of its divisors is an integer number (10782891).

Almost surely, 2^121973620 is an apocalyptic number.

121973620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121973620 is an abundant number, since it is smaller than the sum of its proper divisors (136815764).

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

121973620 is a wasteful number, since it uses less digits than its factorization.

121973620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62979 (or 62977 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 121973620 is about 11044.1667861365. The cubic root of 121973620 is about 495.9318161997.

The spelling of 121973620 in words is "one hundred twenty-one million, nine hundred seventy-three thousand, six hundred twenty".