21421330004 has 24 divisors (see below), whose sum is σ = 37971077760. Its totient is φ = 10572516864.

The previous prime is 21421330003. The next prime is 21421330033. The reversal of 21421330004 is 40003312412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421330003) 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, 2512052 + ... + 2520564.

It is an arithmetic number, because the mean of its divisors is an integer number (1582128240).

Almost surely, 2^21421330004 is an apocalyptic number.

It is an amenable number.

21421330004 is a deficient number, since it is larger than the sum of its proper divisors (16549747756).

21421330004 is a wasteful number, since it uses less digits than its factorization.

21421330004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16559 (or 16557 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21421330004 its reverse (40003312412), we get a palindrome (61424642416).

The spelling of 21421330004 in words is "twenty-one billion, four hundred twenty-one million, three hundred thirty thousand, four".