21213201001 has 16 divisors (see below), whose sum is σ = 23482137600. Its totient is φ = 19097120064.

The previous prime is 21213200999. The next prime is 21213201013. The reversal of 21213201001 is 10010231212.

It is not a de Polignac number, because 21213201001 - 2¹ = 21213200999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213201101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155560 + ... + 258118.

It is an arithmetic number, because the mean of its divisors is an integer number (1467633600).

Almost surely, 2^21213201001 is an apocalyptic number.

It is an amenable number.

21213201001 is a deficient number, since it is larger than the sum of its proper divisors (2268936599).

21213201001 is an equidigital number, since it uses as much as digits as its factorization.

21213201001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102645 (or 102599 counting only the distinct ones).

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

Adding to 21213201001 its reverse (10010231212), we get a palindrome (31223432213).

The spelling of 21213201001 in words is "twenty-one billion, two hundred thirteen million, two hundred one thousand, one".