21213520063 has 2 divisors, whose sum is σ = 21213520064. Its totient is φ = 21213520062.

The previous prime is 21213520061. The next prime is 21213520073. The reversal of 21213520063 is 36002531212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21213520063 - 2¹ = 21213520061 is a prime.

Together with 21213520061, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21213520061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606760031 + 10606760032.

It is an arithmetic number, because the mean of its divisors is an integer number (10606760032).

Almost surely, 2^21213520063 is an apocalyptic number.

21213520063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213520063 is an equidigital number, since it uses as much as digits as its factorization.

21213520063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 25.

The spelling of 21213520063 in words is "twenty-one billion, two hundred thirteen million, five hundred twenty thousand, sixty-three".