21400321033 has 32 divisors (see below), whose sum is σ = 26475724800. Its totient is φ = 16844417856.

The previous prime is 21400320979. The next prime is 21400321049. The reversal of 21400321033 is 33012300412.

It is not a de Polignac number, because 21400321033 - 2³³ = 12810386441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21400321033.

It is not an unprimeable number, because it can be changed into a prime (21400321073) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24797160 + ... + 24798022.

It is an arithmetic number, because the mean of its divisors is an integer number (827366400).

Almost surely, 2^21400321033 is an apocalyptic number.

It is an amenable number.

21400321033 is a deficient number, since it is larger than the sum of its proper divisors (5075403767).

21400321033 is a wasteful number, since it uses less digits than its factorization.

21400321033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1981.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21400321033 its reverse (33012300412), we get a palindrome (54412621445).

The spelling of 21400321033 in words is "twenty-one billion, four hundred million, three hundred twenty-one thousand, thirty-three".