201220636142 has 4 divisors (see below), whose sum is σ = 301830954216. Its totient is φ = 100610318070.

The previous prime is 201220636139. The next prime is 201220636147. The reversal of 201220636142 is 241636022102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 241636022102 = 2 ⋅120818011051.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201220636147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50305159034 + ... + 50305159037.

It is an arithmetic number, because the mean of its divisors is an integer number (75457738554).

Almost surely, 2^201220636142 is an apocalyptic number.

201220636142 is a deficient number, since it is larger than the sum of its proper divisors (100610318074).

201220636142 is a wasteful number, since it uses less digits than its factorization.

201220636142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100610318073.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 201220636142 its reverse (241636022102), we get a palindrome (442856658244).

The spelling of 201220636142 in words is "two hundred one billion, two hundred twenty million, six hundred thirty-six thousand, one hundred forty-two".