20011221312 has 56 divisors (see below), whose sum is σ = 52964486400. Its totient is φ = 6668123136.

The previous prime is 20011221311. The next prime is 20011221317. The reversal of 20011221312 is 21312211002.

It is a junction number, because it is equal to n+sod(n) for n = 20011221291 and 20011221300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011221311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 599889 + ... + 632367.

It is an arithmetic number, because the mean of its divisors is an integer number (945794400).

Almost surely, 2^20011221312 is an apocalyptic number.

It is an amenable number.

20011221312 is an abundant number, since it is smaller than the sum of its proper divisors (32953265088).

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

20011221312 is a wasteful number, since it uses less digits than its factorization.

20011221312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35703 (or 35693 counting only the distinct ones).

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

Adding to 20011221312 its reverse (21312211002), we get a palindrome (41323432314).

The spelling of 20011221312 in words is "twenty billion, eleven million, two hundred twenty-one thousand, three hundred twelve".