21402033043 has 16 divisors (see below), whose sum is σ = 21975970720. Its totient is φ = 20836569600.

The previous prime is 21402033013. The next prime is 21402033047. The reversal of 21402033043 is 34033020412.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21402033043 - 2⁵ = 21402033011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21402033047) 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, 3071083 + ... + 3078043.

It is an arithmetic number, because the mean of its divisors is an integer number (1373498170).

Almost surely, 2^21402033043 is an apocalyptic number.

21402033043 is a deficient number, since it is larger than the sum of its proper divisors (573937677).

21402033043 is a wasteful number, since it uses less digits than its factorization.

21402033043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7558.

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 21402033043 its reverse (34033020412), we get a palindrome (55435053455).

The spelling of 21402033043 in words is "twenty-one billion, four hundred two million, thirty-three thousand, forty-three".