21212001013 has 8 divisors (see below), whose sum is σ = 24367896128. Its totient is φ = 18087508224.

The previous prime is 21212000987. The next prime is 21212001029. The reversal of 21212001013 is 31010021212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21212001013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21212000984 and 21212001002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212001053) 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 7 ways as a sum of consecutive naturals, for example, 7849131 + ... + 7851832.

It is an arithmetic number, because the mean of its divisors is an integer number (3045987016).

Almost surely, 2^21212001013 is an apocalyptic number.

It is an amenable number.

21212001013 is a deficient number, since it is larger than the sum of its proper divisors (3155895115).

21212001013 is a wasteful number, since it uses less digits than its factorization.

21212001013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15701163.

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

Adding to 21212001013 its reverse (31010021212), we get a palindrome (52222022225).

The spelling of 21212001013 in words is "twenty-one billion, two hundred twelve million, one thousand, thirteen".