21002001213 has 8 divisors (see below), whose sum is σ = 28003663008. Its totient is φ = 14000836784.

The previous prime is 21002001203. The next prime is 21002001217. The reversal of 21002001213 is 31210020012.

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 21002001213 - 2³³ = 12412066621 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002001217) 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, 11070 + ... + 205247.

It is an arithmetic number, because the mean of its divisors is an integer number (3500457876).

Almost surely, 2^21002001213 is an apocalyptic number.

It is an amenable number.

21002001213 is a deficient number, since it is larger than the sum of its proper divisors (7001661795).

21002001213 is a wasteful number, since it uses less digits than its factorization.

21002001213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248683.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21002001213 its reverse (31210020012), we get a palindrome (52212021225).

The spelling of 21002001213 in words is "twenty-one billion, two million, one thousand, two hundred thirteen".