20021021201992 has 16 divisors (see below), whose sum is σ = 38833877331900. Its totient is φ = 9665320580160.

The previous prime is 20021021201977. The next prime is 20021021202043. The reversal of 20021021201992 is 29910212012002.

It can be written as a sum of positive squares in 2 ways, for example, as 19754771393956 + 266249808036 = 4444634^2 + 515994^2 .

It is a super-2 number, since 2×20021021201992² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43148752359 + ... + 43148752822.

Almost surely, 2^{20021021201992} is an apocalyptic number.

It is an amenable number.

20021021201992 is a deficient number, since it is larger than the sum of its proper divisors (18812856129908).

20021021201992 is a wasteful number, since it uses less digits than its factorization.

20021021201992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86297505216 (or 86297505212 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

Adding to 20021021201992 its reverse (29910212012002), we get a palindrome (49931233213994).

The spelling of 20021021201992 in words is "twenty trillion, twenty-one billion, twenty-one million, two hundred one thousand, nine hundred ninety-two".