20021211021986 has 8 divisors (see below), whose sum is σ = 30031835866560. Its totient is φ = 10010599066468.

The previous prime is 20021211021979. The next prime is 20021211021989. The reversal of 20021211021986 is 68912011212002.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20021211021989) 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, 3307835 + ... + 7140321.

It is an arithmetic number, because the mean of its divisors is an integer number (3753979483320).

Almost surely, 2^{20021211021986} is an apocalyptic number.

20021211021986 is a deficient number, since it is larger than the sum of its proper divisors (10010624844574).

20021211021986 is a wasteful number, since it uses less digits than its factorization.

20021211021986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6444528.

The product of its (nonzero) digits is 6912, while the sum is 35.

Adding to 20021211021986 its reverse (68912011212002), we get a palindrome (88933222233988).

The spelling of 20021211021986 in words is "twenty trillion, twenty-one billion, two hundred eleven million, twenty-one thousand, nine hundred eighty-six".