142550021 has 4 divisors (see below), whose sum is σ = 148747872. Its totient is φ = 136352172.

The previous prime is 142550003. The next prime is 142550039. The reversal of 142550021 is 120055241.

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: 120055241 = 17 ⋅7062073.

It is an interprime number because it is at equal distance from previous prime (142550003) and next prime (142550039).

It is a cyclic number.

It is not a de Polignac number, because 142550021 - 2¹⁰ = 142548997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 142549975 and 142550002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142550041) 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, 3098891 + ... + 3098936.

It is an arithmetic number, because the mean of its divisors is an integer number (37186968).

Almost surely, 2^142550021 is an apocalyptic number.

It is an amenable number.

142550021 is a deficient number, since it is larger than the sum of its proper divisors (6197851).

142550021 is an equidigital number, since it uses as much as digits as its factorization.

142550021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6197850.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 142550021 is about 11939.4313516180. The cubic root of 142550021 is about 522.3830722075.

The spelling of 142550021 in words is "one hundred forty-two million, five hundred fifty thousand, twenty-one".