1221000122653 has 8 divisors (see below), whose sum is σ = 1223690440320. Its totient is φ = 1218311134560.

The previous prime is 1221000122651. The next prime is 1221000122701. The reversal of 1221000122653 is 3562210001221.

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 1221000122653 - 2¹ = 1221000122651 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221000122651) 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, 1517628 + ... + 2178346.

It is an arithmetic number, because the mean of its divisors is an integer number (152961305040).

Almost surely, 2^{1221000122653} is an apocalyptic number.

It is an amenable number.

1221000122653 is a deficient number, since it is larger than the sum of its proper divisors (2690317667).

1221000122653 is an equidigital number, since it uses as much as digits as its factorization.

1221000122653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664787.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 1221000122653 its reverse (3562210001221), we get a palindrome (4783210123874).

The spelling of 1221000122653 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-two thousand, six hundred fifty-three".