142121331 has 16 divisors (see below), whose sum is σ = 229691520. Its totient is φ = 86133960.

The previous prime is 142121327. The next prime is 142121333. The reversal of 142121331 is 133121241.

142121331 is a `hidden beast` number, since 1 + 421 + 213 + 31 = 666.

142121331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 142121331 - 2² = 142121327 is a prime.

It is a super-2 number, since 2×142121331² = 40396945450423122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (142121333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 238965 + ... + 239558.

It is an arithmetic number, because the mean of its divisors is an integer number (14355720).

Almost surely, 2^142121331 is an apocalyptic number.

142121331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

142121331 is a deficient number, since it is larger than the sum of its proper divisors (87570189).

142121331 is a wasteful number, since it uses less digits than its factorization.

142121331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478543 (or 478537 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 142121331 is about 11921.4651364671. The cubic root of 142121331 is about 521.8588930260.

Adding to 142121331 its reverse (133121241), we get a palindrome (275242572).

The spelling of 142121331 in words is "one hundred forty-two million, one hundred twenty-one thousand, three hundred thirty-one".