121771620 has 48 divisors (see below), whose sum is σ = 378846720. Its totient is φ = 32472288.

The previous prime is 121771619. The next prime is 121771649. The reversal of 121771620 is 26177121.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 112212 + ... + 113291.

It is an arithmetic number, because the mean of its divisors is an integer number (7892640).

Almost surely, 2^121771620 is an apocalyptic number.

121771620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121771620 is an abundant number, since it is smaller than the sum of its proper divisors (257075100).

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

121771620 is a wasteful number, since it uses less digits than its factorization.

121771620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225521 (or 225513 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 27.

The square root of 121771620 is about 11035.0178975840. The cubic root of 121771620 is about 495.6578947310.

The spelling of 121771620 in words is "one hundred twenty-one million, seven hundred seventy-one thousand, six hundred twenty".