21212263243503 has 8 divisors (see below), whose sum is σ = 31425575175600. Its totient is φ = 14141508828984.

The previous prime is 21212263243441. The next prime is 21212263243513. The reversal of 21212263243503 is 30534236221212.

21212263243503 is a `hidden beast` number, since 2 + 1 + 2 + 12 + 2 + 632 + 4 + 3 + 5 + 0 + 3 = 666.

It is not a de Polignac number, because 21212263243503 - 2⁸ = 21212263243247 is a prime.

It is a super-2 number, since 2×21212263243503² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212263243513) 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, 392819689668 + ... + 392819689721.

It is an arithmetic number, because the mean of its divisors is an integer number (3928196896950).

Almost surely, 2^{21212263243503} is an apocalyptic number.

21212263243503 is a deficient number, since it is larger than the sum of its proper divisors (10213311932097).

21212263243503 is an equidigital number, since it uses as much as digits as its factorization.

21212263243503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785639379398 (or 785639379392 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

Adding to 21212263243503 its reverse (30534236221212), we get a palindrome (51746499464715).

The spelling of 21212263243503 in words is "twenty-one trillion, two hundred twelve billion, two hundred sixty-three million, two hundred forty-three thousand, five hundred three".