21120001213 has 8 divisors (see below), whose sum is σ = 21176919936. Its totient is φ = 21063120000.

The previous prime is 21120001207. The next prime is 21120001219. The reversal of 21120001213 is 31210002112.

It is an interprime number because it is at equal distance from previous prime (21120001207) and next prime (21120001219).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21120001213 - 2²⁵ = 21086446781 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21120001193 and 21120001202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120001219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1393645 + ... + 1408717.

It is an arithmetic number, because the mean of its divisors is an integer number (2647114992).

Almost surely, 2^21120001213 is an apocalyptic number.

It is an amenable number.

21120001213 is a deficient number, since it is larger than the sum of its proper divisors (56918723).

21120001213 is a wasteful number, since it uses less digits than its factorization.

21120001213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18755.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21120001213 its reverse (31210002112), we get a palindrome (52330003325).

The spelling of 21120001213 in words is "twenty-one billion, one hundred twenty million, one thousand, two hundred thirteen".