21213130001 has 4 divisors (see below), whose sum is σ = 24243577152. Its totient is φ = 18182682852.

The previous prime is 21213129991. The next prime is 21213130019. The reversal of 21213130001 is 10003131212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21213130001 - 2¹⁴ = 21213113617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21213130031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1515223565 + ... + 1515223578.

It is an arithmetic number, because the mean of its divisors is an integer number (6060894288).

Almost surely, 2^21213130001 is an apocalyptic number.

It is an amenable number.

21213130001 is a deficient number, since it is larger than the sum of its proper divisors (3030447151).

21213130001 is an equidigital number, since it uses as much as digits as its factorization.

21213130001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030447150.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21213130001 its reverse (10003131212), we get a palindrome (31216261213).

The spelling of 21213130001 in words is "twenty-one billion, two hundred thirteen million, one hundred thirty thousand, one".