20001000222021 has 64 divisors (see below), whose sum is σ = 33633384744960. Its totient is φ = 10289925676800.

The previous prime is 20001000222013. The next prime is 20001000222023. The reversal of 20001000222021 is 12022200010002.

It is not a de Polignac number, because 20001000222021 - 2³ = 20001000222013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20001000221988 and 20001000222006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001000222023) 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 63 ways as a sum of consecutive naturals, for example, 7013770 + ... + 9444308.

It is an arithmetic number, because the mean of its divisors is an integer number (525521636640).

Almost surely, 2^{20001000222021} is an apocalyptic number.

20001000222021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20001000222021 is a deficient number, since it is larger than the sum of its proper divisors (13632384522939).

20001000222021 is a wasteful number, since it uses less digits than its factorization.

20001000222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2431306.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20001000222021 its reverse (12022200010002), we get a palindrome (32023200232023).

The spelling of 20001000222021 in words is "twenty trillion, one billion, two hundred twenty-two thousand, twenty-one".