21042052041 has 16 divisors (see below), whose sum is σ = 28347580800. Its totient is φ = 13882589568.

The previous prime is 21042052027. The next prime is 21042052051. The reversal of 21042052041 is 14025024012.

It is not a de Polignac number, because 21042052041 - 2¹⁸ = 21041789897 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21042051999 and 21042052017.

It is not an unprimeable number, because it can be changed into a prime (21042052051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236005 + ... + 312701.

It is an arithmetic number, because the mean of its divisors is an integer number (1771723800).

Almost surely, 2^21042052041 is an apocalyptic number.

It is an amenable number.

21042052041 is a deficient number, since it is larger than the sum of its proper divisors (7305528759).

21042052041 is a wasteful number, since it uses less digits than its factorization.

21042052041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77648.

The product of its (nonzero) digits is 640, while the sum is 21.

Adding to 21042052041 its reverse (14025024012), we get a palindrome (35067076053).

The spelling of 21042052041 in words is "twenty-one billion, forty-two million, fifty-two thousand, forty-one".