21212303204 has 24 divisors (see below), whose sum is σ = 38502315768. Its totient is φ = 10217318400.

The previous prime is 21212303201. The next prime is 21212303221. The reversal of 21212303204 is 40230321212.

It can be written as a sum of positive squares in 4 ways, for example, as 14604239104 + 6608064100 = 120848^2 + 81290^2 .

It is not an unprimeable number, because it can be changed into a prime (21212303201) 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, 694589 + ... + 724484.

It is an arithmetic number, because the mean of its divisors is an integer number (1604263157).

Almost surely, 2^21212303204 is an apocalyptic number.

It is an amenable number.

21212303204 is a deficient number, since it is larger than the sum of its proper divisors (17290012564).

21212303204 is a wasteful number, since it uses less digits than its factorization.

21212303204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419215 (or 1419213 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21212303204 its reverse (40230321212), we get a palindrome (61442624416).

The spelling of 21212303204 in words is "twenty-one billion, two hundred twelve million, three hundred three thousand, two hundred four".