121211321252555 has 16 divisors (see below), whose sum is σ = 146631228044544. Its totient is φ = 96185842447200.

The previous prime is 121211321252479. The next prime is 121211321252569. The reversal of 121211321252555 is 555252123112121.

It is not a de Polignac number, because 121211321252555 - 2³² = 121207026285259 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117013469 + ... + 118044798.

It is an arithmetic number, because the mean of its divisors is an integer number (9164451752784).

Almost surely, 2^{121211321252555} is an apocalyptic number.

121211321252555 is a deficient number, since it is larger than the sum of its proper divisors (25419906791989).

121211321252555 is a wasteful number, since it uses less digits than its factorization.

121211321252555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235059106.

The product of its digits is 60000, while the sum is 38.

Adding to 121211321252555 its reverse (555252123112121), we get a palindrome (676463444364676).

The spelling of 121211321252555 in words is "one hundred twenty-one trillion, two hundred eleven billion, three hundred twenty-one million, two hundred fifty-two thousand, five hundred fifty-five".