20102210021 has 4 divisors (see below), whose sum is σ = 20104364544. Its totient is φ = 20100055500.

The previous prime is 20102209991. The next prime is 20102210033. The reversal of 20102210021 is 12001220102.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12001220102 = 2 ⋅6000610051.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20102210021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20102209984 and 20102210011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102210041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1063205 + ... + 1081946.

It is an arithmetic number, because the mean of its divisors is an integer number (5026091136).

Almost surely, 2^20102210021 is an apocalyptic number.

It is an amenable number.

20102210021 is a deficient number, since it is larger than the sum of its proper divisors (2154523).

20102210021 is an equidigital number, since it uses as much as digits as its factorization.

20102210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2154522.

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

Adding to 20102210021 its reverse (12001220102), we get a palindrome (32103430123).

The spelling of 20102210021 in words is "twenty billion, one hundred two million, two hundred ten thousand, twenty-one".