121221100012144 has 80 divisors (see below), whose sum is σ = 269710933824000. Its totient is φ = 52198831157760.

The previous prime is 121221100012057. The next prime is 121221100012213. The reversal of 121221100012144 is 441210001122121.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

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, 108858372 + ... + 109966300.

It is an arithmetic number, because the mean of its divisors is an integer number (3371386672800).

Almost surely, 2^{121221100012144} is an apocalyptic number.

It is an amenable number.

121221100012144 is an abundant number, since it is smaller than the sum of its proper divisors (148489833811856).

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

121221100012144 is a wasteful number, since it uses less digits than its factorization.

121221100012144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140686 (or 1140680 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 121221100012144 its reverse (441210001122121), we get a palindrome (562431101134265).

The spelling of 121221100012144 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one hundred million, twelve thousand, one hundred forty-four".