21010102121113 has 4 divisors (see below), whose sum is σ = 24011545281280. Its totient is φ = 18008658960948.

The previous prime is 21010102121059. The next prime is 21010102121123. The reversal of 21010102121113 is 31112120101012.

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 21010102121113 - 2¹³ = 21010102112921 is a prime.

It is a super-2 number, since 2×21010102121113² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010102121123) 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, 1500721580073 + ... + 1500721580086.

It is an arithmetic number, because the mean of its divisors is an integer number (6002886320320).

Almost surely, 2^{21010102121113} is an apocalyptic number.

It is an amenable number.

21010102121113 is a deficient number, since it is larger than the sum of its proper divisors (3001443160167).

21010102121113 is an equidigital number, since it uses as much as digits as its factorization.

21010102121113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3001443160166.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 21010102121113 its reverse (31112120101012), we get a palindrome (52122222222125).

The spelling of 21010102121113 in words is "twenty-one trillion, ten billion, one hundred two million, one hundred twenty-one thousand, one hundred thirteen".