20011221112 has 8 divisors (see below), whose sum is σ = 37521039600. Its totient is φ = 10005610552.

The previous prime is 20011221107. The next prime is 20011221127. The reversal of 20011221112 is 21112211002.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 20011221092 and 20011221101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1250701312 + ... + 1250701327.

It is an arithmetic number, because the mean of its divisors is an integer number (4690129950).

Almost surely, 2^20011221112 is an apocalyptic number.

It is an amenable number.

20011221112 is a deficient number, since it is larger than the sum of its proper divisors (17509818488).

20011221112 is a wasteful number, since it uses less digits than its factorization.

20011221112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2501402645 (or 2501402641 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20011221112 its reverse (21112211002), we get a palindrome (41123432114).

The spelling of 20011221112 in words is "twenty billion, eleven million, two hundred twenty-one thousand, one hundred twelve".