121421300551 has 16 divisors (see below), whose sum is σ = 123727308544. Its totient is φ = 119133483264.

The previous prime is 121421300549. The next prime is 121421300597. The reversal of 121421300551 is 155003124121.

It is a cyclic number.

It is not a de Polignac number, because 121421300551 - 2¹ = 121421300549 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 (121421300521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41623945 + ... + 41626861.

It is an arithmetic number, because the mean of its divisors is an integer number (7732956784).

Almost surely, 2^121421300551 is an apocalyptic number.

121421300551 is a deficient number, since it is larger than the sum of its proper divisors (2306007993).

121421300551 is a wasteful number, since it uses less digits than its factorization.

121421300551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5770.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 121421300551 its reverse (155003124121), we get a palindrome (276424424672).

The spelling of 121421300551 in words is "one hundred twenty-one billion, four hundred twenty-one million, three hundred thousand, five hundred fifty-one".