21002152013 has 2 divisors, whose sum is σ = 21002152014. Its totient is φ = 21002152012.

The previous prime is 21002151991. The next prime is 21002152069. The reversal of 21002152013 is 31025120012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12666827209 + 8335324804 = 112547^2 + 91298^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002152013 - 2¹⁴ = 21002135629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21002151982 and 21002152000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21002152513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501076006 + 10501076007.

It is an arithmetic number, because the mean of its divisors is an integer number (10501076007).

Almost surely, 2^21002152013 is an apocalyptic number.

It is an amenable number.

21002152013 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002152013 is an equidigital number, since it uses as much as digits as its factorization.

21002152013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 21002152013 its reverse (31025120012), we get a palindrome (52027272025).

The spelling of 21002152013 in words is "twenty-one billion, two million, one hundred fifty-two thousand, thirteen".