21031110143434 has 16 divisors (see below), whose sum is σ = 31968048101472. Its totient is φ = 10375421908048.

The previous prime is 21031110143363. The next prime is 21031110143579. The reversal of 21031110143434 is 43434101113012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81820864 + ... + 82077499.

It is an arithmetic number, because the mean of its divisors is an integer number (1998003006342).

Almost surely, 2^{21031110143434} is an apocalyptic number.

21031110143434 is a deficient number, since it is larger than the sum of its proper divisors (10936937958038).

21031110143434 is a wasteful number, since it uses less digits than its factorization.

21031110143434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163899221.

The product of its (nonzero) digits is 3456, while the sum is 28.

Adding to 21031110143434 its reverse (43434101113012), we get a palindrome (64465211256446).

The spelling of 21031110143434 in words is "twenty-one trillion, thirty-one billion, one hundred ten million, one hundred forty-three thousand, four hundred thirty-four".