20021001211020 has 48 divisors (see below), whose sum is σ = 56080848176640. Its totient is φ = 5336834152896.

The previous prime is 20021001211007. The next prime is 20021001211051. The reversal of 20021001211020 is 2011210012002.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20021001210987 and 20021001211005.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65455630 + ... + 65760789.

It is an arithmetic number, because the mean of its divisors is an integer number (1168351003680).

Almost surely, 2^{20021001211020} is an apocalyptic number.

20021001211020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021001211020 is an abundant number, since it is smaller than the sum of its proper divisors (36059846965620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20021001211020 is a wasteful number, since it uses less digits than its factorization.

20021001211020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131218974 (or 131218972 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20021001211020 its reverse (2011210012002), we get a palindrome (22032211223022).

The spelling of 20021001211020 in words is "twenty trillion, twenty-one billion, one million, two hundred eleven thousand, twenty".