21110220012 has 48 divisors (see below), whose sum is σ = 56385002240. Its totient is φ = 6021732672.

The previous prime is 21110219993. The next prime is 21110220029. The reversal of 21110220012 is 21002201112.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21110220012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151003 + ... + 254994.

Almost surely, 2^21110220012 is an apocalyptic number.

It is an amenable number.

21110220012 is an abundant number, since it is smaller than the sum of its proper divisors (35274782228).

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

21110220012 is a wasteful number, since it uses less digits than its factorization.

21110220012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406630 (or 406628 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21110220012 its reverse (21002201112), we get a palindrome (42112421124).

The spelling of 21110220012 in words is "twenty-one billion, one hundred ten million, two hundred twenty thousand, twelve".