1221001121032 has 128 divisors (see below), whose sum is σ = 2925793198080. Its totient is φ = 463872096000.

The previous prime is 1221001120987. The next prime is 1221001121059. The reversal of 1221001121032 is 2301211001221.

It is a super-2 number, since 2×1221001121032² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221001120997 and 1221001121015.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7768182 + ... + 7923802.

It is an arithmetic number, because the mean of its divisors is an integer number (22857759360).

Almost surely, 2^{1221001121032} 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 1221001121032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1462896599040).

1221001121032 is an abundant number, since it is smaller than the sum of its proper divisors (1704792077048).

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

1221001121032 is a wasteful number, since it uses less digits than its factorization.

1221001121032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155963 (or 155959 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 1221001121032 its reverse (2301211001221), we get a palindrome (3522212122253).

The spelling of 1221001121032 in words is "one trillion, two hundred twenty-one billion, one million, one hundred twenty-one thousand, thirty-two".