20021210992 has 20 divisors (see below), whose sum is σ = 38811799120. Its totient is φ = 10005262848.

The previous prime is 20021210983. The next prime is 20021210999. The reversal of 20021210992 is 29901212002.

It is a self number, because there is not a number n which added to its sum of digits gives 20021210992.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021210999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302913 + ... + 363040.

It is an arithmetic number, because the mean of its divisors is an integer number (1940589956).

Almost surely, 2^20021210992 is an apocalyptic number.

It is an amenable number.

20021210992 is a deficient number, since it is larger than the sum of its proper divisors (18790588128).

20021210992 is a wasteful number, since it uses less digits than its factorization.

20021210992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667840 (or 667834 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

Adding to 20021210992 its reverse (29901212002), we get a palindrome (49922422994).

The spelling of 20021210992 in words is "twenty billion, twenty-one million, two hundred ten thousand, nine hundred ninety-two".