210122140042 has 4 divisors (see below), whose sum is σ = 315183210066. Its totient is φ = 105061070020.

The previous prime is 210122140021. The next prime is 210122140051. The reversal of 210122140042 is 240041221012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 155954697921 + 54167442121 = 394911^2 + 232739^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52530535009 + ... + 52530535012.

Almost surely, 2^210122140042 is an apocalyptic number.

210122140042 is a deficient number, since it is larger than the sum of its proper divisors (105061070024).

210122140042 is a wasteful number, since it uses less digits than its factorization.

210122140042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105061070023.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 210122140042 its reverse (240041221012), we get a palindrome (450163361054).

The spelling of 210122140042 in words is "two hundred ten billion, one hundred twenty-two million, one hundred forty thousand, forty-two".