121230421135510 has 16 divisors (see below), whose sum is σ = 220145862099456. Its totient is φ = 48063034219648.

The previous prime is 121230421135339. The next prime is 121230421135513. The reversal of 121230421135510 is 15531124032121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121230421135513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53641778134 + ... + 53641780393.

It is an arithmetic number, because the mean of its divisors is an integer number (13759116381216).

Almost surely, 2^{121230421135510} is an apocalyptic number.

121230421135510 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121230421135510 is a deficient number, since it is larger than the sum of its proper divisors (98915440963946).

121230421135510 is a wasteful number, since it uses less digits than its factorization.

121230421135510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107283558647.

The product of its (nonzero) digits is 7200, while the sum is 31.

Adding to 121230421135510 its reverse (15531124032121), we get a palindrome (136761545167631).

The spelling of 121230421135510 in words is "one hundred twenty-one trillion, two hundred thirty billion, four hundred twenty-one million, one hundred thirty-five thousand, five hundred ten".