21221202503 has 2 divisors, whose sum is σ = 21221202504. Its totient is φ = 21221202502.

The previous prime is 21221202473. The next prime is 21221202511. The reversal of 21221202503 is 30520212212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21221202503 - 2¹² = 21221198407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221202203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610601251 + 10610601252.

It is an arithmetic number, because the mean of its divisors is an integer number (10610601252).

Almost surely, 2^21221202503 is an apocalyptic number.

21221202503 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221202503 is an equidigital number, since it uses as much as digits as its factorization.

21221202503 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 20.

Adding to 21221202503 its reverse (30520212212), we get a palindrome (51741414715).

The spelling of 21221202503 in words is "twenty-one billion, two hundred twenty-one million, two hundred two thousand, five hundred three".