20001201001021 has 32 divisors (see below), whose sum is σ = 21720495513600. Its totient is φ = 18363185544000.

The previous prime is 20001201001007. The next prime is 20001201001027. The reversal of 20001201001021 is 12010010210002.

It is a de Polignac number, because none of the positive numbers 2^k-20001201001021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20001201000989 and 20001201001007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001201001027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72422046 + ... + 72697696.

It is an arithmetic number, because the mean of its divisors is an integer number (678765484800).

Almost surely, 2^{20001201001021} is an apocalyptic number.

It is an amenable number.

20001201001021 is a deficient number, since it is larger than the sum of its proper divisors (1719294512579).

20001201001021 is a wasteful number, since it uses less digits than its factorization.

20001201001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276537.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20001201001021 its reverse (12010010210002), we get a palindrome (32011211211023).

The spelling of 20001201001021 in words is "twenty trillion, one billion, two hundred one million, one thousand, twenty-one".