121243334345551 has 4 divisors (see below), whose sum is σ = 132265455649704. Its totient is φ = 110221213041400.

The previous prime is 121243334345537. The next prime is 121243334345591. The reversal of 121243334345551 is 155543433342121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121243334345551 - 2³³ = 121234744410959 is a prime.

It is a super-2 number, since 2×121243334345551² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121243334345591) 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, 5511060652060 + ... + 5511060652081.

It is an arithmetic number, because the mean of its divisors is an integer number (33066363912426).

Almost surely, 2^{121243334345551} is an apocalyptic number.

121243334345551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121243334345551 is a deficient number, since it is larger than the sum of its proper divisors (11022121304153).

121243334345551 is a wasteful number, since it uses less digits than its factorization.

121243334345551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11022121304152.

The product of its digits is 2592000, while the sum is 46.

Adding to 121243334345551 its reverse (155543433342121), we get a palindrome (276786767687672).

The spelling of 121243334345551 in words is "one hundred twenty-one trillion, two hundred forty-three billion, three hundred thirty-four million, three hundred forty-five thousand, five hundred fifty-one".