121345043523 has 16 divisors (see below), whose sum is σ = 177338393472. Its totient is φ = 73193904000.

The previous prime is 121345043497. The next prime is 121345043537. The reversal of 121345043523 is 325340543121.

It is not a de Polignac number, because 121345043523 - 2⁶ = 121345043459 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (121345043593) 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, 8706598 + ... + 8720523.

It is an arithmetic number, because the mean of its divisors is an integer number (11083649592).

Almost surely, 2^121345043523 is an apocalyptic number.

121345043523 is a deficient number, since it is larger than the sum of its proper divisors (55993349949).

121345043523 is a wasteful number, since it uses less digits than its factorization.

121345043523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17427346.

The product of its (nonzero) digits is 43200, while the sum is 33.

Adding to 121345043523 its reverse (325340543121), we get a palindrome (446685586644).

The spelling of 121345043523 in words is "one hundred twenty-one billion, three hundred forty-five million, forty-three thousand, five hundred twenty-three".