1321101021 has 8 divisors (see below), whose sum is σ = 1809075424. Its totient is φ = 856930320.

The previous prime is 1321101017. The next prime is 1321101029. The reversal of 1321101021 is 1201011231.

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

It is not a de Polignac number, because 1321101021 - 2² = 1321101017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321100988 and 1321101006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321101029) 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, 5950795 + ... + 5951016.

It is an arithmetic number, because the mean of its divisors is an integer number (226134428).

Almost surely, 2^1321101021 is an apocalyptic number.

It is an amenable number.

1321101021 is a deficient number, since it is larger than the sum of its proper divisors (487974403).

1321101021 is a wasteful number, since it uses less digits than its factorization.

1321101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11901851.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 1321101021 is about 36346.9533936477. The cubic root of 1321101021 is about 1097.2662200293.

Adding to 1321101021 its reverse (1201011231), we get a palindrome (2522112252).

The spelling of 1321101021 in words is "one billion, three hundred twenty-one million, one hundred one thousand, twenty-one".