121215143213534 has 16 divisors (see below), whose sum is σ = 187689142602240. Its totient is φ = 58652120240280.

The previous prime is 121215143213509. The next prime is 121215143213537. The reversal of 121215143213534 is 435312341512121.

It is a super-2 number, since 2×121215143213534² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121215143213537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3942497 + ... + 16061555.

It is an arithmetic number, because the mean of its divisors is an integer number (11730571412640).

Almost surely, 2^{121215143213534} is an apocalyptic number.

121215143213534 is a deficient number, since it is larger than the sum of its proper divisors (66473999388706).

121215143213534 is a wasteful number, since it uses less digits than its factorization.

121215143213534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12280415.

The product of its digits is 86400, while the sum is 38.

Adding to 121215143213534 its reverse (435312341512121), we get a palindrome (556527484725655).

The spelling of 121215143213534 in words is "one hundred twenty-one trillion, two hundred fifteen billion, one hundred forty-three million, two hundred thirteen thousand, five hundred thirty-four".