155201121012 has 48 divisors (see below), whose sum is σ = 414075909632. Its totient is φ = 44321078880.

The previous prime is 155201121011. The next prime is 155201121043. The reversal of 155201121012 is 210121102551.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 155201121012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155201121011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 290458 + ... + 628305.

Almost surely, 2^155201121012 is an apocalyptic number.

155201121012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

155201121012 is an abundant number, since it is smaller than the sum of its proper divisors (258874788620).

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

155201121012 is a wasteful number, since it uses less digits than its factorization.

155201121012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920788 (or 920786 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 21.

Adding to 155201121012 its reverse (210121102551), we get a palindrome (365322223563).

The spelling of 155201121012 in words is "one hundred fifty-five billion, two hundred one million, one hundred twenty-one thousand, twelve".