21040022503 has 2 divisors, whose sum is σ = 21040022504. Its totient is φ = 21040022502.

The previous prime is 21040022453. The next prime is 21040022519. The reversal of 21040022503 is 30522004012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21040022503 - 2²⁵ = 21006468071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21040022543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520011251 + 10520011252.

It is an arithmetic number, because the mean of its divisors is an integer number (10520011252).

Almost surely, 2^21040022503 is an apocalyptic number.

21040022503 is a deficient number, since it is larger than the sum of its proper divisors (1).

21040022503 is an equidigital number, since it uses as much as digits as its factorization.

21040022503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 19.

Adding to 21040022503 its reverse (30522004012), we get a palindrome (51562026515).

It can be divided in two parts, 210400 and 22503, that added together give a triangular number (232903 = T₆₈₂).

The spelling of 21040022503 in words is "twenty-one billion, forty million, twenty-two thousand, five hundred three".