21034020011042 has 16 divisors (see below), whose sum is σ = 31587380804952. Its totient is φ = 10504900055040.

The previous prime is 21034020011033. The next prime is 21034020011047. The reversal of 21034020011042 is 24011002043012.

It can be written as a sum of positive squares in 4 ways, for example, as 14677626037321 + 6356393973721 = 3831139^2 + 2521189^2 .

It is not an unprimeable number, because it can be changed into a prime (21034020011047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4290818 + ... + 7776834.

Almost surely, 2^{21034020011042} is an apocalyptic number.

21034020011042 is a deficient number, since it is larger than the sum of its proper divisors (10553360793910).

21034020011042 is a wasteful number, since it uses less digits than its factorization.

21034020011042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3489493.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21034020011042 its reverse (24011002043012), we get a palindrome (45045022054054).

The spelling of 21034020011042 in words is "twenty-one trillion, thirty-four billion, twenty million, eleven thousand, forty-two".