210440340210442 has 4 divisors (see below), whose sum is σ = 315660510315666. Its totient is φ = 105220170105220.

The previous prime is 210440340210437. The next prime is 210440340210469. The reversal of 210440340210442 is 244012043044012.

It is a happy number.

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., 209015518402161 + 1424821808281 = 14457369^2 + 1193659^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52610085052609 + ... + 52610085052612.

Almost surely, 2^{210440340210442} is an apocalyptic number.

210440340210442 is a deficient number, since it is larger than the sum of its proper divisors (105220170105224).

210440340210442 is a wasteful number, since it uses less digits than its factorization.

210440340210442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105220170105223.

The product of its (nonzero) digits is 24576, while the sum is 31.

Adding to 210440340210442 its reverse (244012043044012), we get a palindrome (454452383254454).

The spelling of 210440340210442 in words is "two hundred ten trillion, four hundred forty billion, three hundred forty million, two hundred ten thousand, four hundred forty-two".