20010211021 has 4 divisors (see below), whose sum is σ = 20349367200. Its totient is φ = 19671054844.

The previous prime is 20010210971. The next prime is 20010211027. The reversal of 20010211021 is 12011201002.

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 20010211021 - 2⁹ = 20010210509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20010210989 and 20010211007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010211027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169578001 + ... + 169578118.

It is an arithmetic number, because the mean of its divisors is an integer number (5087341800).

Almost surely, 2^20010211021 is an apocalyptic number.

It is an amenable number.

20010211021 is a deficient number, since it is larger than the sum of its proper divisors (339156179).

20010211021 is an equidigital number, since it uses as much as digits as its factorization.

20010211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339156178.

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

Adding to 20010211021 its reverse (12011201002), we get a palindrome (32021412023).

The spelling of 20010211021 in words is "twenty billion, ten million, two hundred eleven thousand, twenty-one".