142126021 has 4 divisors (see below), whose sum is σ = 142282944. Its totient is φ = 141969100.

The previous prime is 142126009. The next prime is 142126027. The reversal of 142126021 is 120621241.

142126021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120621241 = 13 ⋅9278557.

It is a cyclic number.

It is not a de Polignac number, because 142126021 - 2¹¹ = 142123973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 142126021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142126027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77095 + ... + 78916.

It is an arithmetic number, because the mean of its divisors is an integer number (35570736).

Almost surely, 2^142126021 is an apocalyptic number.

It is an amenable number.

142126021 is a deficient number, since it is larger than the sum of its proper divisors (156923).

142126021 is an equidigital number, since it uses as much as digits as its factorization.

142126021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156922.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 142126021 is about 11921.6618388545. The cubic root of 142126021 is about 521.8646334059.

Adding to 142126021 its reverse (120621241), we get a palindrome (262747262).

The spelling of 142126021 in words is "one hundred forty-two million, one hundred twenty-six thousand, twenty-one".