121421654502 has 16 divisors (see below), whose sum is σ = 242855952192. Its totient is φ = 40471777640.

The previous prime is 121421654477. The next prime is 121421654569. The reversal of 121421654502 is 205456124121.

It is a happy number.

121421654502 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 399588 + ... + 634439.

It is an arithmetic number, because the mean of its divisors is an integer number (15178497012).

Almost surely, 2^121421654502 is an apocalyptic number.

121421654502 is an abundant number, since it is smaller than the sum of its proper divisors (121434297690).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121421654502 is a wasteful number, since it uses less digits than its factorization.

121421654502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053603.

The product of its (nonzero) digits is 19200, while the sum is 33.

Adding to 121421654502 its reverse (205456124121), we get a palindrome (326877778623).

The spelling of 121421654502 in words is "one hundred twenty-one billion, four hundred twenty-one million, six hundred fifty-four thousand, five hundred two".