21001219204 has 48 divisors (see below), whose sum is σ = 43543858176. Its totient is φ = 8672716800.

The previous prime is 21001219199. The next prime is 21001219231. The reversal of 21001219204 is 40291210012.

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, 150324 + ... + 254164.

It is an arithmetic number, because the mean of its divisors is an integer number (907163712).

Almost surely, 2^21001219204 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 21001219204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21771929088).

21001219204 is an abundant number, since it is smaller than the sum of its proper divisors (22542638972).

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

21001219204 is a wasteful number, since it uses less digits than its factorization.

21001219204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104116 (or 104114 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 21001219204 its reverse (40291210012), we get a palindrome (61292429216).

The spelling of 21001219204 in words is "twenty-one billion, one million, two hundred nineteen thousand, two hundred four".