121421299072 has 64 divisors (see below), whose sum is σ = 257005483200. Its totient is φ = 56977703424.

The previous prime is 121421299061. The next prime is 121421299073. The reversal of 121421299072 is 270992124121.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×121421299072² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121421299073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26923 + ... + 493525.

It is an arithmetic number, because the mean of its divisors is an integer number (4015710675).

Almost surely, 2^121421299072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121421299072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128502741600).

121421299072 is an abundant number, since it is smaller than the sum of its proper divisors (135584184128).

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

121421299072 is a wasteful number, since it uses less digits than its factorization.

121421299072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466743 (or 466731 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The spelling of 121421299072 in words is "one hundred twenty-one billion, four hundred twenty-one million, two hundred ninety-nine thousand, seventy-two".