1021161221017 has 4 divisors (see below), whose sum is σ = 1167041395456. Its totient is φ = 875281046580.

The previous prime is 1021161220979. The next prime is 1021161221051. The reversal of 1021161221017 is 7101221611201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1021161221017 - 2²³ = 1021152832409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021161220982 and 1021161221000.

It is not an unprimeable number, because it can be changed into a prime (1021161221317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72940087209 + ... + 72940087222.

It is an arithmetic number, because the mean of its divisors is an integer number (291760348864).

Almost surely, 2^{1021161221017} is an apocalyptic number.

It is an amenable number.

1021161221017 is a deficient number, since it is larger than the sum of its proper divisors (145880174439).

1021161221017 is an equidigital number, since it uses as much as digits as its factorization.

1021161221017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145880174438.

The product of its (nonzero) digits is 336, while the sum is 25.

Adding to 1021161221017 its reverse (7101221611201), we get a palindrome (8122382832218).

The spelling of 1021161221017 in words is "one trillion, twenty-one billion, one hundred sixty-one million, two hundred twenty-one thousand, seventeen".