121205553401 has 4 divisors (see below), whose sum is σ = 121688444304. Its totient is φ = 120722662500.

The previous prime is 121205553383. The next prime is 121205553449. The reversal of 121205553401 is 104355502121.

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-121205553401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121205553101) 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, 241445075 + ... + 241445576.

It is an arithmetic number, because the mean of its divisors is an integer number (30422111076).

Almost surely, 2^121205553401 is an apocalyptic number.

It is an amenable number.

121205553401 is a deficient number, since it is larger than the sum of its proper divisors (482890903).

121205553401 is an equidigital number, since it uses as much as digits as its factorization.

121205553401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482890902.

The product of its (nonzero) digits is 6000, while the sum is 29.

The spelling of 121205553401 in words is "one hundred twenty-one billion, two hundred five million, five hundred fifty-three thousand, four hundred one".