142212021 has 16 divisors (see below), whose sum is σ = 229451904. Its totient is φ = 76483584.

The previous prime is 142212019. The next prime is 142212029. The reversal of 142212021 is 120212241.

It is not a de Polignac number, because 142212021 - 2¹ = 142212019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142212029) 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, 198820 + ... + 199533.

It is an arithmetic number, because the mean of its divisors is an integer number (14340744).

Almost surely, 2^142212021 is an apocalyptic number.

It is an amenable number.

142212021 is a deficient number, since it is larger than the sum of its proper divisors (87239883).

142212021 is a wasteful number, since it uses less digits than its factorization.

142212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398380.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 142212021 is about 11925.2681730852. The cubic root of 142212021 is about 521.9698717216.

Adding to 142212021 its reverse (120212241), we get a palindrome (262424262).

It can be divided in two parts, 1422120 and 21, that added together give a triangular number (1422141 = T₁₆₈₆).

The spelling of 142212021 in words is "one hundred forty-two million, two hundred twelve thousand, twenty-one".