20001002212021 has 16 divisors (see below), whose sum is σ = 21812867596800. Its totient is φ = 18281260343808.

The previous prime is 20001002212013. The next prime is 20001002212049. The reversal of 20001002212021 is 12021220010002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20001002212021 - 2³ = 20001002212013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001002211992 and 20001002212010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001002212001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154504941 + ... + 154634338.

It is an arithmetic number, because the mean of its divisors is an integer number (1363304224800).

Almost surely, 2^{20001002212021} is an apocalyptic number.

It is an amenable number.

20001002212021 is a deficient number, since it is larger than the sum of its proper divisors (1811865384779).

20001002212021 is a wasteful number, since it uses less digits than its factorization.

20001002212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309139428.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20001002212021 its reverse (12021220010002), we get a palindrome (32022222222023).

The spelling of 20001002212021 in words is "twenty trillion, one billion, two million, two hundred twelve thousand, twenty-one".