210210031420042 has 4 divisors (see below), whose sum is σ = 315315047130066. Its totient is φ = 105105015710020.

The previous prime is 210210031420031. The next prime is 210210031420061. The reversal of 210210031420042 is 240024130012012.

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., 176276365701921 + 33933665718121 = 13276911^2 + 5825261^2 .

It is a junction number, because it is equal to n+sod(n) for n = 210210031419995 and 210210031420022.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52552507855009 + ... + 52552507855012.

Almost surely, 2^{210210031420042} is an apocalyptic number.

210210031420042 is a deficient number, since it is larger than the sum of its proper divisors (105105015710024).

210210031420042 is a wasteful number, since it uses less digits than its factorization.

210210031420042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105105015710023.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 210210031420042 its reverse (240024130012012), we get a palindrome (450234161432054).

The spelling of 210210031420042 in words is "two hundred ten trillion, two hundred ten billion, thirty-one million, four hundred twenty thousand, forty-two".