121721889238 has 8 divisors (see below), whose sum is σ = 184782627288. Its totient is φ = 60127680144.

The previous prime is 121721889229. The next prime is 121721889281. The reversal of 121721889238 is 832988127121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 366632031 + ... + 366632362.

It is an arithmetic number, because the mean of its divisors is an integer number (23097828411).

Almost surely, 2^121721889238 is an apocalyptic number.

121721889238 is a deficient number, since it is larger than the sum of its proper divisors (63060738050).

121721889238 is an equidigital number, since it uses as much as digits as its factorization.

121721889238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733264478.

The product of its digits is 774144, while the sum is 52.

The spelling of 121721889238 in words is "one hundred twenty-one billion, seven hundred twenty-one million, eight hundred eighty-nine thousand, two hundred thirty-eight".