20001011211021 has 32 divisors (see below), whose sum is σ = 27143392066560. Its totient is φ = 13098171090944.

The previous prime is 20001011211019. The next prime is 20001011211031. The reversal of 20001011211021 is 12011211010002.

It is a cyclic number.

It is not a de Polignac number, because 20001011211021 - 2¹ = 20001011211019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20001011210988 and 20001011211006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001011211031) 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, 450278605 + ... + 450323021.

It is an arithmetic number, because the mean of its divisors is an integer number (848231002080).

Almost surely, 2^{20001011211021} is an apocalyptic number.

It is an amenable number.

20001011211021 is a deficient number, since it is larger than the sum of its proper divisors (7142380855539).

20001011211021 is a wasteful number, since it uses less digits than its factorization.

20001011211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54785.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20001011211021 its reverse (12011211010002), we get a palindrome (32012222221023).

The spelling of 20001011211021 in words is "twenty trillion, one billion, eleven million, two hundred eleven thousand, twenty-one".