21214204004 has 48 divisors (see below), whose sum is σ = 43952092800. Its totient is φ = 8766164736.

The previous prime is 21214203979. The next prime is 21214204009. The reversal of 21214204004 is 40040241212.

It is not an unprimeable number, because it can be changed into a prime (21214204009) 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, 582392 + ... + 617744.

It is an arithmetic number, because the mean of its divisors is an integer number (915668600).

Almost surely, 2^21214204004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21214204004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21976046400).

21214204004 is an abundant number, since it is smaller than the sum of its proper divisors (22737888796).

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

21214204004 is a wasteful number, since it uses less digits than its factorization.

21214204004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36132 (or 36130 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21214204004 its reverse (40040241212), we get a palindrome (61254445216).

The spelling of 21214204004 in words is "twenty-one billion, two hundred fourteen million, two hundred four thousand, four".