155121524421 has 32 divisors (see below), whose sum is σ = 223654502400. Its totient is φ = 95299778880.

The previous prime is 155121524387. The next prime is 155121524431. The reversal of 155121524421 is 124425121551.

It is not a de Polignac number, because 155121524421 - 2⁶ = 155121524357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155121524431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12392556 + ... + 12405066.

It is an arithmetic number, because the mean of its divisors is an integer number (6989203200).

Almost surely, 2^155121524421 is an apocalyptic number.

It is an amenable number.

155121524421 is a deficient number, since it is larger than the sum of its proper divisors (68532977979).

155121524421 is a wasteful number, since it uses less digits than its factorization.

155121524421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18449.

The product of its digits is 16000, while the sum is 33.

Adding to 155121524421 its reverse (124425121551), we get a palindrome (279546645972).

The spelling of 155121524421 in words is "one hundred fifty-five billion, one hundred twenty-one million, five hundred twenty-four thousand, four hundred twenty-one".