21213402212 has 48 divisors (see below), whose sum is σ = 39184992000. Its totient is φ = 10033887360.

The previous prime is 21213402211. The next prime is 21213402229. The reversal of 21213402212 is 21220431212.

It is not an unprimeable number, because it can be changed into a prime (21213402211) 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, 1855289 + ... + 1866687.

It is an arithmetic number, because the mean of its divisors is an integer number (816354000).

Almost surely, 2^21213402212 is an apocalyptic number.

It is an amenable number.

21213402212 is a deficient number, since it is larger than the sum of its proper divisors (17971589788).

21213402212 is a wasteful number, since it uses less digits than its factorization.

21213402212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11756 (or 11754 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21213402212 its reverse (21220431212), we get a palindrome (42433833424).

The spelling of 21213402212 in words is "twenty-one billion, two hundred thirteen million, four hundred two thousand, two hundred twelve".