21402010213 has 8 divisors (see below), whose sum is σ = 21437677976. Its totient is φ = 21366374400.

The previous prime is 21402010211. The next prime is 21402010219. The reversal of 21402010213 is 31201020412.

It can be written as a sum of positive squares in 4 ways, for example, as 2147117569 + 19254892644 = 46337^2 + 138762^2 .

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 21402010213 - 2¹ = 21402010211 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 (21402010211) 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, 1585573 + ... + 1599013.

It is an arithmetic number, because the mean of its divisors is an integer number (2679709747).

Almost surely, 2^21402010213 is an apocalyptic number.

It is an amenable number.

21402010213 is a deficient number, since it is larger than the sum of its proper divisors (35667763).

21402010213 is a wasteful number, since it uses less digits than its factorization.

21402010213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15975.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21402010213 its reverse (31201020412), we get a palindrome (52603030625).

The spelling of 21402010213 in words is "twenty-one billion, four hundred two million, ten thousand, two hundred thirteen".