21001411213 has 4 divisors (see below), whose sum is σ = 21077228860. Its totient is φ = 20925593568.

The previous prime is 21001411183. The next prime is 21001411229. The reversal of 21001411213 is 31211410012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9284864164 + 11716547049 = 96358^2 + 108243^2 .

It is a cyclic number.

It is not a de Polignac number, because 21001411213 - 2¹³ = 21001403021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001411273) 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, 37908408 + ... + 37908961.

It is an arithmetic number, because the mean of its divisors is an integer number (5269307215).

Almost surely, 2^21001411213 is an apocalyptic number.

It is an amenable number.

21001411213 is a deficient number, since it is larger than the sum of its proper divisors (75817647).

21001411213 is an equidigital number, since it uses as much as digits as its factorization.

21001411213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75817646.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21001411213 its reverse (31211410012), we get a palindrome (52212821225).

The spelling of 21001411213 in words is "twenty-one billion, one million, four hundred eleven thousand, two hundred thirteen".