21401015213 has 8 divisors (see below), whose sum is σ = 21557684280. Its totient is φ = 21244907520.

The previous prime is 21401015159. The next prime is 21401015227. The reversal of 21401015213 is 31251010412.

It can be written as a sum of positive squares in 4 ways, for example, as 923977609 + 20477037604 = 30397^2 + 143098^2 .

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 21401015213 - 2¹⁰ = 21401014189 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 (21401015513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63668 + ... + 216461.

It is an arithmetic number, because the mean of its divisors is an integer number (2694710535).

Almost surely, 2^21401015213 is an apocalyptic number.

It is an amenable number.

21401015213 is a deficient number, since it is larger than the sum of its proper divisors (156669067).

21401015213 is a wasteful number, since it uses less digits than its factorization.

21401015213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280687.

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 21401015213 its reverse (31251010412), we get a palindrome (52652025625).

The spelling of 21401015213 in words is "twenty-one billion, four hundred one million, fifteen thousand, two hundred thirteen".