121221697204416 has 112 divisors (see below), whose sum is σ = 347496671389824. Its totient is φ = 37145909907456.

The previous prime is 121221697204343. The next prime is 121221697204453. The reversal of 121221697204416 is 614402796122121.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 431708490 + ... + 431989193.

Almost surely, 2^{121221697204416} is an apocalyptic number.

121221697204416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121221697204416 is an abundant number, since it is smaller than the sum of its proper divisors (226274974185408).

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

121221697204416 is a wasteful number, since it uses less digits than its factorization.

121221697204416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863697758 (or 863697748 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 48.

The spelling of 121221697204416 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, six hundred ninety-seven million, two hundred four thousand, four hundred sixteen".