21421122004 has 24 divisors (see below), whose sum is σ = 38660830208. Its totient is φ = 10379093760.

The previous prime is 21421122001. The next prime is 21421122043. The reversal of 21421122004 is 40022112412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421122001) 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, 468477 + ... + 512164.

Almost surely, 2^21421122004 is an apocalyptic number.

It is an amenable number.

21421122004 is a deficient number, since it is larger than the sum of its proper divisors (17239708204).

21421122004 is a wasteful number, since it uses less digits than its factorization.

21421122004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980815 (or 980813 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21421122004 its reverse (40022112412), we get a palindrome (61443234416).

The spelling of 21421122004 in words is "twenty-one billion, four hundred twenty-one million, one hundred twenty-two thousand, four".