126421155 has 80 divisors (see below), whose sum is σ = 272743680. Its totient is φ = 54727488.

The previous prime is 126421091. The next prime is 126421159. The reversal of 126421155 is 551124621.

126421155 is a `hidden beast` number, since 1 + 2 + 642 + 1 + 15 + 5 = 666.

It is not a de Polignac number, because 126421155 - 2⁶ = 126421091 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126421159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 52692 + ... + 55038.

It is an arithmetic number, because the mean of its divisors is an integer number (3409296).

Almost surely, 2^126421155 is an apocalyptic number.

126421155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

126421155 is an abundant number, since it is smaller than the sum of its proper divisors (146322525).

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

126421155 is a wasteful number, since it uses less digits than its factorization.

126421155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2390 (or 2381 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 126421155 is about 11243.7162450855. The cubic root of 126421155 is about 501.8877372600.

Adding to 126421155 its reverse (551124621), we get a palindrome (677545776).

The spelling of 126421155 in words is "one hundred twenty-six million, four hundred twenty-one thousand, one hundred fifty-five".