121254135212 has 72 divisors (see below), whose sum is σ = 254680710480. Its totient is φ = 50333391360.

The previous prime is 121254135173. The next prime is 121254135221. The reversal of 121254135212 is 212531452121.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1062728 + ... + 1171280.

It is an arithmetic number, because the mean of its divisors is an integer number (3537232090).

Almost surely, 2^121254135212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121254135212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127340355240).

121254135212 is an abundant number, since it is smaller than the sum of its proper divisors (133426575268).

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

121254135212 is a wasteful number, since it uses less digits than its factorization.

121254135212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108751 (or 108742 counting only the distinct ones).

The product of its digits is 4800, while the sum is 29.

Adding to 121254135212 its reverse (212531452121), we get a palindrome (333785587333).

The spelling of 121254135212 in words is "one hundred twenty-one billion, two hundred fifty-four million, one hundred thirty-five thousand, two hundred twelve".