21203000004 has 48 divisors (see below), whose sum is σ = 50303405376. Its totient is φ = 6949219200.

The previous prime is 21203000003. The next prime is 21203000009. The reversal of 21203000004 is 40000030212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (21203000003) 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, 3830719 + ... + 3836249.

It is an arithmetic number, because the mean of its divisors is an integer number (1047987612).

Almost surely, 2^21203000004 is an apocalyptic number.

It is an amenable number.

21203000004 is an abundant number, since it is smaller than the sum of its proper divisors (29100405372).

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

21203000004 is a wasteful number, since it uses less digits than its factorization.

21203000004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10836 (or 10834 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

Adding to 21203000004 its reverse (40000030212), we get a palindrome (61203030216).

The spelling of 21203000004 in words is "twenty-one billion, two hundred three million, four", and thus it is an aban number.