155321235420 has 96 divisors (see below), whose sum is σ = 495903498048. Its totient is φ = 35983921152.

The previous prime is 155321235409. The next prime is 155321235431. The reversal of 155321235420 is 24532123551.

It is an interprime number because it is at equal distance from previous prime (155321235409) and next prime (155321235431).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5843499 + ... + 5870018.

It is an arithmetic number, because the mean of its divisors is an integer number (5165661438).

Almost surely, 2^155321235420 is an apocalyptic number.

155321235420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155321235420 is an abundant number, since it is smaller than the sum of its proper divisors (340582262628).

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

155321235420 is a wasteful number, since it uses less digits than its factorization.

155321235420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11713559 (or 11713557 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

Adding to 155321235420 its reverse (24532123551), we get a palindrome (179853358971).

The spelling of 155321235420 in words is "one hundred fifty-five billion, three hundred twenty-one million, two hundred thirty-five thousand, four hundred twenty".