21002204212 has 48 divisors (see below), whose sum is σ = 40937726592. Its totient is φ = 9346596480.

The previous prime is 21002204147. The next prime is 21002204213. The reversal of 21002204212 is 21240220012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002204213) 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, 1126438 + ... + 1144930.

It is an arithmetic number, because the mean of its divisors is an integer number (852869304).

Almost surely, 2^21002204212 is an apocalyptic number.

21002204212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21002204212 is a deficient number, since it is larger than the sum of its proper divisors (19935522380).

21002204212 is a wasteful number, since it uses less digits than its factorization.

21002204212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19048 (or 19046 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21002204212 its reverse (21240220012), we get a palindrome (42242424224).

The spelling of 21002204212 in words is "twenty-one billion, two million, two hundred four thousand, two hundred twelve".