20012001002021 has 4 divisors (see below), whose sum is σ = 22870858288032. Its totient is φ = 17153143716012.

The previous prime is 20012001002009. The next prime is 20012001002023. The reversal of 20012001002021 is 12020010021002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20012001002021 - 2³⁴ = 19994821132837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20012001001993 and 20012001002011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012001002023) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1429428642995 + ... + 1429428643008.

It is an arithmetic number, because the mean of its divisors is an integer number (5717714572008).

Almost surely, 2^{20012001002021} is an apocalyptic number.

It is an amenable number.

20012001002021 is a deficient number, since it is larger than the sum of its proper divisors (2858857286011).

20012001002021 is an equidigital number, since it uses as much as digits as its factorization.

20012001002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2858857286010.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20012001002021 its reverse (12020010021002), we get a palindrome (32032011023023).

The spelling of 20012001002021 in words is "twenty trillion, twelve billion, one million, two thousand, twenty-one".