21000235004 has 48 divisors (see below), whose sum is σ = 42379954176. Its totient is φ = 8919072000.

The previous prime is 21000234971. The next prime is 21000235027. The reversal of 21000235004 is 40053200012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1824989 + ... + 1836459.

It is an arithmetic number, because the mean of its divisors is an integer number (882915712).

Almost surely, 2^21000235004 is an apocalyptic number.

It is an amenable number.

21000235004 is an abundant number, since it is smaller than the sum of its proper divisors (21379719172).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21000235004 is a wasteful number, since it uses less digits than its factorization.

21000235004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12066 (or 12064 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

Adding to 21000235004 its reverse (40053200012), we get a palindrome (61053435016).

The spelling of 21000235004 in words is "twenty-one billion, two hundred thirty-five thousand, four".