21220111020012 has 24 divisors (see below), whose sum is σ = 50069924881200. Its totient is φ = 6993894268416.

The previous prime is 21220111020001. The next prime is 21220111020049. The reversal of 21220111020012 is 21002011102212.

It is a super-2 number, since 2×21220111020012² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21220111019973 and 21220111020000.

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, 9934507837 + ... + 9934509972.

It is an arithmetic number, because the mean of its divisors is an integer number (2086246870050).

Almost surely, 2^{21220111020012} is an apocalyptic number.

It is an amenable number.

21220111020012 is an abundant number, since it is smaller than the sum of its proper divisors (28849813861188).

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

21220111020012 is a wasteful number, since it uses less digits than its factorization.

21220111020012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19869017905 (or 19869017903 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21220111020012 its reverse (21002011102212), we get a palindrome (42222122122224).

The spelling of 21220111020012 in words is "twenty-one trillion, two hundred twenty billion, one hundred eleven million, twenty thousand, twelve".