20105210213 has 4 divisors (see below), whose sum is σ = 21932956608. Its totient is φ = 18277463820.

The previous prime is 20105210201. The next prime is 20105210231. The reversal of 20105210213 is 31201250102.

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.

It is not a de Polignac number, because 20105210213 - 2¹⁶ = 20105144677 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20105210191 and 20105210200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20105210233) 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, 913873181 + ... + 913873202.

It is an arithmetic number, because the mean of its divisors is an integer number (5483239152).

Almost surely, 2^20105210213 is an apocalyptic number.

It is an amenable number.

20105210213 is a deficient number, since it is larger than the sum of its proper divisors (1827746395).

20105210213 is a wasteful number, since it uses less digits than its factorization.

20105210213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1827746394.

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 20105210213 its reverse (31201250102), we get a palindrome (51306460315).

The spelling of 20105210213 in words is "twenty billion, one hundred five million, two hundred ten thousand, two hundred thirteen".