142336821 has 16 divisors (see below), whose sum is σ = 211442688. Its totient is φ = 84428400.

The previous prime is 142336819. The next prime is 142336879. The reversal of 142336821 is 128633241.

It is not a de Polignac number, because 142336821 - 2¹ = 142336819 is a prime.

It is a super-2 number, since 2×142336821² = 40519541224772082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142336021) 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, 44335 + ... + 47436.

It is an arithmetic number, because the mean of its divisors is an integer number (13215168).

Almost surely, 2^142336821 is an apocalyptic number.

142336821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

142336821 is a deficient number, since it is larger than the sum of its proper divisors (69105867).

142336821 is a wasteful number, since it uses less digits than its factorization.

142336821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91832.

The product of its digits is 6912, while the sum is 30.

The square root of 142336821 is about 11930.4996123381. The cubic root of 142336821 is about 522.1225142185.

The spelling of 142336821 in words is "one hundred forty-two million, three hundred thirty-six thousand, eight hundred twenty-one".