21213010113 has 4 divisors (see below), whose sum is σ = 28284013488. Its totient is φ = 14142006740.

The previous prime is 21213010111. The next prime is 21213010153. The reversal of 21213010113 is 31101031212.

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 a cyclic number.

It is not a de Polignac number, because 21213010113 - 2¹ = 21213010111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21213010092 and 21213010101.

It is not an unprimeable number, because it can be changed into a prime (21213010111) 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, 3535501683 + ... + 3535501688.

It is an arithmetic number, because the mean of its divisors is an integer number (7071003372).

Almost surely, 2^21213010113 is an apocalyptic number.

It is an amenable number.

21213010113 is a deficient number, since it is larger than the sum of its proper divisors (7071003375).

21213010113 is an equidigital number, since it uses as much as digits as its factorization.

21213010113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7071003374.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21213010113 its reverse (31101031212), we get a palindrome (52314041325).

The spelling of 21213010113 in words is "twenty-one billion, two hundred thirteen million, ten thousand, one hundred thirteen".