21002101213 has 8 divisors (see below), whose sum is σ = 21147080256. Its totient is φ = 20857200000.

The previous prime is 21002101181. The next prime is 21002101249. The reversal of 21002101213 is 31210120012.

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 21002101213 - 2⁵ = 21002101181 is a prime.

It is a super-2 number, since 2×21002101213² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21002101193 and 21002101202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002102213) 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, 586770 + ... + 621532.

It is an arithmetic number, because the mean of its divisors is an integer number (2643385032).

Almost surely, 2^21002101213 is an apocalyptic number.

It is an amenable number.

21002101213 is a deficient number, since it is larger than the sum of its proper divisors (144979043).

21002101213 is a wasteful number, since it uses less digits than its factorization.

21002101213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38915.

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

Adding to 21002101213 its reverse (31210120012), we get a palindrome (52212221225).

The spelling of 21002101213 in words is "twenty-one billion, two million, one hundred one thousand, two hundred thirteen".