155121205012 has 48 divisors (see below), whose sum is σ = 292795148800. Its totient is φ = 71671430880.

The previous prime is 155121205007. The next prime is 155121205079. The reversal of 155121205012 is 210502121551.

It is a happy number.

It is a congruent 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, 2382937 + ... + 2447167.

Almost surely, 2^155121205012 is an apocalyptic number.

It is an amenable number.

155121205012 is a deficient number, since it is larger than the sum of its proper divisors (137673943788).

155121205012 is a wasteful number, since it uses less digits than its factorization.

155121205012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65036 (or 65034 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 25.

Adding to 155121205012 its reverse (210502121551), we get a palindrome (365623326563).

The spelling of 155121205012 in words is "one hundred fifty-five billion, one hundred twenty-one million, two hundred five thousand, twelve".