142471021 has 16 divisors (see below), whose sum is σ = 178126848. Its totient is φ = 110703600.

The previous prime is 142471003. The next prime is 142471057. The reversal of 142471021 is 120174241.

It is not a de Polignac number, because 142471021 - 2⁹ = 142470509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 142470983 and 142471001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142471061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27076 + ... + 31906.

It is an arithmetic number, because the mean of its divisors is an integer number (11132928).

Almost surely, 2^142471021 is an apocalyptic number.

142471021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

142471021 is a deficient number, since it is larger than the sum of its proper divisors (35655827).

142471021 is a wasteful number, since it uses less digits than its factorization.

142471021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5232.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 142471021 is about 11936.1225278564. The cubic root of 142471021 is about 522.2865543016.

The spelling of 142471021 in words is "one hundred forty-two million, four hundred seventy-one thousand, twenty-one".