155412213100 has 72 divisors (see below), whose sum is σ = 339318282240. Its totient is φ = 61783590720.

The previous prime is 155412213091. The next prime is 155412213109. The reversal of 155412213100 is 1312214551.

It is an interprime number because it is at equal distance from previous prime (155412213091) and next prime (155412213109).

It is a super-2 number, since 2×155412213100² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (155412213109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13773261 + ... + 13784539.

It is an arithmetic number, because the mean of its divisors is an integer number (4712753920).

Almost surely, 2^155412213100 is an apocalyptic number.

155412213100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155412213100 is an abundant number, since it is smaller than the sum of its proper divisors (183906069140).

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

155412213100 is a wasteful number, since it uses less digits than its factorization.

155412213100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12127 (or 12120 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 155412213100 its reverse (1312214551), we get a palindrome (156724427651).

The spelling of 155412213100 in words is "one hundred fifty-five billion, four hundred twelve million, two hundred thirteen thousand, one hundred".