142121100 has 72 divisors (see below), whose sum is σ = 448596288. Its totient is φ = 34452800.

The previous prime is 142121099. The next prime is 142121113. The reversal of 142121100 is 1121241.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 18234 + ... + 24833.

It is an arithmetic number, because the mean of its divisors is an integer number (6230504).

Almost surely, 2^142121100 is an apocalyptic number.

142121100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

142121100 is an abundant number, since it is smaller than the sum of its proper divisors (306475188).

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

142121100 is a wasteful number, since it uses less digits than its factorization.

142121100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43095 (or 43088 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 142121100 is about 11921.4554480567. The cubic root of 142121100 is about 521.8586102876.

Adding to 142121100 its reverse (1121241), we get a palindrome (143242341).

The spelling of 142121100 in words is "one hundred forty-two million, one hundred twenty-one thousand, one hundred".