121354430455 has 32 divisors (see below), whose sum is σ = 155005415424. Its totient is φ = 91003625856.

The previous prime is 121354430443. The next prime is 121354430459. The reversal of 121354430455 is 554034453121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121354430455 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121354430459) 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, 5395042 + ... + 5417488.

It is an arithmetic number, because the mean of its divisors is an integer number (4843919232).

Almost surely, 2^121354430455 is an apocalyptic number.

121354430455 is a deficient number, since it is larger than the sum of its proper divisors (33650984969).

121354430455 is a wasteful number, since it uses less digits than its factorization.

121354430455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23415.

The product of its (nonzero) digits is 144000, while the sum is 37.

Adding to 121354430455 its reverse (554034453121), we get a palindrome (675388883576).

The spelling of 121354430455 in words is "one hundred twenty-one billion, three hundred fifty-four million, four hundred thirty thousand, four hundred fifty-five".