21034520213 has 8 divisors (see below), whose sum is σ = 24043842240. Its totient is φ = 18026295840.

The previous prime is 21034520113. The next prime is 21034520317. The reversal of 21034520213 is 31202543012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21034520213 - 2¹⁴ = 21034503829 is a prime.

It is a super-2 number, since 2×21034520213² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034520113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232928 + ... + 310361.

It is an arithmetic number, because the mean of its divisors is an integer number (3005480280).

Almost surely, 2^21034520213 is an apocalyptic number.

It is an amenable number.

21034520213 is a deficient number, since it is larger than the sum of its proper divisors (3009322027).

21034520213 is an equidigital number, since it uses as much as digits as its factorization.

21034520213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548827.

The product of its (nonzero) digits is 1440, while the sum is 23.

The spelling of 21034520213 in words is "twenty-one billion, thirty-four million, five hundred twenty thousand, two hundred thirteen".