121201606621 has 4 divisors (see below), whose sum is σ = 123255871200. Its totient is φ = 119147342044.

The previous prime is 121201606619. The next prime is 121201606639. The reversal of 121201606621 is 126606102121.

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 121201606621 - 2¹ = 121201606619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121201606621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201606681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1027132201 + ... + 1027132318.

It is an arithmetic number, because the mean of its divisors is an integer number (30813967800).

Almost surely, 2^121201606621 is an apocalyptic number.

It is an amenable number.

121201606621 is a deficient number, since it is larger than the sum of its proper divisors (2054264579).

121201606621 is an equidigital number, since it uses as much as digits as its factorization.

121201606621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2054264578.

The product of its (nonzero) digits is 1728, while the sum is 28.

Adding to 121201606621 its reverse (126606102121), we get a palindrome (247807708742).

The spelling of 121201606621 in words is "one hundred twenty-one billion, two hundred one million, six hundred six thousand, six hundred twenty-one".