20011221982 has 8 divisors (see below), whose sum is σ = 30096034200. Its totient is φ = 9979210584.

The previous prime is 20011221961. The next prime is 20011221983. The reversal of 20011221982 is 28912211002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20011221982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011221983) 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, 13199257 + ... + 13200772.

It is an arithmetic number, because the mean of its divisors is an integer number (3762004275).

Almost surely, 2^20011221982 is an apocalyptic number.

20011221982 is a deficient number, since it is larger than the sum of its proper divisors (10084812218).

20011221982 is a wasteful number, since it uses less digits than its factorization.

20011221982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26400410.

The product of its (nonzero) digits is 1152, while the sum is 28.

Adding to 20011221982 its reverse (28912211002), we get a palindrome (48923432984).

The spelling of 20011221982 in words is "twenty billion, eleven million, two hundred twenty-one thousand, nine hundred eighty-two".