121351123551 has 8 divisors (see below), whose sum is σ = 184915997824. Its totient is φ = 69343499160.

The previous prime is 121351123457. The next prime is 121351123603. The reversal of 121351123551 is 155321153121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121351123551 - 2¹⁰ = 121351122527 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 (121351123151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2889312445 + ... + 2889312486.

It is an arithmetic number, because the mean of its divisors is an integer number (23114499728).

Almost surely, 2^121351123551 is an apocalyptic number.

121351123551 is a deficient number, since it is larger than the sum of its proper divisors (63564874273).

121351123551 is an equidigital number, since it uses as much as digits as its factorization.

121351123551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5778624941.

The product of its digits is 4500, while the sum is 30.

Adding to 121351123551 its reverse (155321153121), we get a palindrome (276672276672).

The spelling of 121351123551 in words is "one hundred twenty-one billion, three hundred fifty-one million, one hundred twenty-three thousand, five hundred fifty-one".