121155101543 has 32 divisors (see below), whose sum is σ = 150167001600. Its totient is φ = 95370347520.

The previous prime is 121155101533. The next prime is 121155101579. The reversal of 121155101543 is 345101551121.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-121155101543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121155101503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5356448 + ... + 5379018.

It is an arithmetic number, because the mean of its divisors is an integer number (4692718800).

Almost surely, 2^121155101543 is an apocalyptic number.

121155101543 is a deficient number, since it is larger than the sum of its proper divisors (29011900057).

121155101543 is a wasteful number, since it uses less digits than its factorization.

121155101543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23687.

The product of its (nonzero) digits is 3000, while the sum is 29.

Adding to 121155101543 its reverse (345101551121), we get a palindrome (466256652664).

The spelling of 121155101543 in words is "one hundred twenty-one billion, one hundred fifty-five million, one hundred one thousand, five hundred forty-three".