121891242216 has 64 divisors (see below), whose sum is σ = 309464064000. Its totient is φ = 40003616448.

The previous prime is 121891242181. The next prime is 121891242269. The reversal of 121891242216 is 612242198121.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 272985 + ... + 564183.

It is an arithmetic number, because the mean of its divisors is an integer number (4835376000).

Almost surely, 2^121891242216 is an apocalyptic number.

It is an amenable number.

121891242216 is an abundant number, since it is smaller than the sum of its proper divisors (187572821784).

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

121891242216 is a wasteful number, since it uses less digits than its factorization.

121891242216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291478 (or 291474 counting only the distinct ones).

The product of its digits is 27648, while the sum is 39.

The spelling of 121891242216 in words is "one hundred twenty-one billion, eight hundred ninety-one million, two hundred forty-two thousand, two hundred sixteen".