20011221232 has 20 divisors (see below), whose sum is σ = 38863848616. Its totient is φ = 9981840960.

The previous prime is 20011221193. The next prime is 20011221239. The reversal of 20011221232 is 23212211002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011221239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1478658 + ... + 1492129.

Almost surely, 2^20011221232 is an apocalyptic number.

It is an amenable number.

20011221232 is a deficient number, since it is larger than the sum of its proper divisors (18852627384).

20011221232 is a wasteful number, since it uses less digits than its factorization.

20011221232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2971216 (or 2971210 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20011221232 its reverse (23212211002), we get a palindrome (43223432234).

The spelling of 20011221232 in words is "twenty billion, eleven million, two hundred twenty-one thousand, two hundred thirty-two".