142201055721 has 4 divisors (see below), whose sum is σ = 189601407632. Its totient is φ = 94800703812.

The previous prime is 142201055693. The next prime is 142201055747. The reversal of 142201055721 is 127550102241.

It is a happy number.

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: 127550102241 = 3 ⋅42516700747.

It is not a de Polignac number, because 142201055721 - 2³¹ = 140053572073 is a prime.

It is a super-2 number, since 2×142201055721² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (142201050721) 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, 23700175951 + ... + 23700175956.

It is an arithmetic number, because the mean of its divisors is an integer number (47400351908).

Almost surely, 2^142201055721 is an apocalyptic number.

It is an amenable number.

142201055721 is a deficient number, since it is larger than the sum of its proper divisors (47400351911).

142201055721 is an equidigital number, since it uses as much as digits as its factorization.

142201055721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47400351910.

The product of its (nonzero) digits is 5600, while the sum is 30.

Adding to 142201055721 its reverse (127550102241), we get a palindrome (269751157962).

The spelling of 142201055721 in words is "one hundred forty-two billion, two hundred one million, fifty-five thousand, seven hundred twenty-one".