21113220012 has 24 divisors (see below), whose sum is σ = 49269587136. Its totient is φ = 7036967568.

The previous prime is 21113219983. The next prime is 21113220043. The reversal of 21113220012 is 21002231112.

It is a junction number, because it is equal to n+sod(n) for n = 21113219973 and 21113220000.

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, 23283 + ... + 206805.

It is an arithmetic number, because the mean of its divisors is an integer number (2052899464).

Almost surely, 2^21113220012 is an apocalyptic number.

It is an amenable number.

21113220012 is an abundant number, since it is smaller than the sum of its proper divisors (28156367124).

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

21113220012 is a wasteful number, since it uses less digits than its factorization.

21113220012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193117 (or 193115 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21113220012 its reverse (21002231112), we get a palindrome (42115451124).

The spelling of 21113220012 in words is "twenty-one billion, one hundred thirteen million, two hundred twenty thousand, twelve".