1221032001020 has 48 divisors (see below), whose sum is σ = 2761659538848. Its totient is φ = 450801980160.

The previous prime is 1221032001017. The next prime is 1221032001031. The reversal of 1221032001020 is 201002301221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1221032000986 and 1221032001004.

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, 2761082 + ... + 3172638.

It is an arithmetic number, because the mean of its divisors is an integer number (57534573726).

Almost surely, 2^{1221032001020} is an apocalyptic number.

1221032001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221032001020 is an abundant number, since it is smaller than the sum of its proper divisors (1540627537828).

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

1221032001020 is a wasteful number, since it uses less digits than its factorization.

1221032001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422990 (or 422988 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 1221032001020 its reverse (201002301221), we get a palindrome (1422034302241).

The spelling of 1221032001020 in words is "one trillion, two hundred twenty-one billion, thirty-two million, one thousand, twenty".