121220653 has 4 divisors (see below), whose sum is σ = 121326048. Its totient is φ = 121115260.

The previous prime is 121220639. The next prime is 121220657. The reversal of 121220653 is 356022121.

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 a de Polignac number, because none of the positive numbers 2^k-121220653 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220657) 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, 50953 + ... + 53278.

It is an arithmetic number, because the mean of its divisors is an integer number (30331512).

Almost surely, 2^121220653 is an apocalyptic number.

It is an amenable number.

121220653 is a deficient number, since it is larger than the sum of its proper divisors (105395).

121220653 is a wasteful number, since it uses less digits than its factorization.

121220653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105394.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 121220653 is about 11010.0251135045. The cubic root of 121220653 is about 494.9092143813.

Adding to 121220653 its reverse (356022121), we get a palindrome (477242774).

The spelling of 121220653 in words is "one hundred twenty-one million, two hundred twenty thousand, six hundred fifty-three".