21221134012 has 24 divisors (see below), whose sum is σ = 40443051600. Its totient is φ = 9684318336.

The previous prime is 21221134003. The next prime is 21221134049. The reversal of 21221134012 is 21043112212.

It is a super-2 number, since 2×21221134012² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2288062 + ... + 2297317.

It is an arithmetic number, because the mean of its divisors is an integer number (1685127150).

Almost surely, 2^21221134012 is an apocalyptic number.

It is an amenable number.

21221134012 is a deficient number, since it is larger than the sum of its proper divisors (19221917588).

21221134012 is a wasteful number, since it uses less digits than its factorization.

21221134012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4585485 (or 4585483 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21221134012 its reverse (21043112212), we get a palindrome (42264246224).

The spelling of 21221134012 in words is "twenty-one billion, two hundred twenty-one million, one hundred thirty-four thousand, twelve".