1221001031021 has 8 divisors (see below), whose sum is σ = 1285585078080. Its totient is φ = 1156449067488.

The previous prime is 1221001031017. The next prime is 1221001031053. The reversal of 1221001031021 is 1201301001221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221001031021 - 2² = 1221001031017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1221001030987 and 1221001031005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221001031821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7942736 + ... + 8095001.

It is an arithmetic number, because the mean of its divisors is an integer number (160698134760).

Almost surely, 2^{1221001031021} is an apocalyptic number.

It is an amenable number.

1221001031021 is a deficient number, since it is larger than the sum of its proper divisors (64584047059).

1221001031021 is a wasteful number, since it uses less digits than its factorization.

1221001031021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16041763.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 1221001031021 its reverse (1201301001221), we get a palindrome (2422302032242).

The spelling of 1221001031021 in words is "one trillion, two hundred twenty-one billion, one million, thirty-one thousand, twenty-one".