121220501 has 4 divisors (see below), whose sum is σ = 122927904. Its totient is φ = 119513100.

The previous prime is 121220479. The next prime is 121220507. The reversal of 121220501 is 105022121.

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-121220501 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 (121220507) 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, 853595 + ... + 853736.

It is an arithmetic number, because the mean of its divisors is an integer number (30731976).

Almost surely, 2^121220501 is an apocalyptic number.

It is an amenable number.

121220501 is a deficient number, since it is larger than the sum of its proper divisors (1707403).

121220501 is an equidigital number, since it uses as much as digits as its factorization.

121220501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1707402.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 121220501 is about 11010.0182107025. The cubic root of 121220501 is about 494.9090075237.

Adding to 121220501 its reverse (105022121), we get a palindrome (226242622).

The spelling of 121220501 in words is "one hundred twenty-one million, two hundred twenty thousand, five hundred one".