20102011021 has 4 divisors (see below), whose sum is σ = 20207257344. Its totient is φ = 19996764700.

The previous prime is 20102010953. The next prime is 20102011037. The reversal of 20102011021 is 12011020102.

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 20102011021 - 2²⁹ = 19565140109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20102010989 and 20102011007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102011081) 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, 52622875 + ... + 52623256.

It is an arithmetic number, because the mean of its divisors is an integer number (5051814336).

Almost surely, 2^20102011021 is an apocalyptic number.

It is an amenable number.

20102011021 is a deficient number, since it is larger than the sum of its proper divisors (105246323).

20102011021 is a wasteful number, since it uses less digits than its factorization.

20102011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105246322.

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

Adding to 20102011021 its reverse (12011020102), we get a palindrome (32113031123).

The spelling of 20102011021 in words is "twenty billion, one hundred two million, eleven thousand, twenty-one".