21221201503 has 2 divisors, whose sum is σ = 21221201504. Its totient is φ = 21221201502.

The previous prime is 21221201471. The next prime is 21221201531. The reversal of 21221201503 is 30510212212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21221201503 - 2⁵ = 21221201471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221202503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610600751 + 10610600752.

It is an arithmetic number, because the mean of its divisors is an integer number (10610600752).

Almost surely, 2^21221201503 is an apocalyptic number.

21221201503 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221201503 is an equidigital number, since it uses as much as digits as its factorization.

21221201503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 21221201503 its reverse (30510212212), we get a palindrome (51731413715).

The spelling of 21221201503 in words is "twenty-one billion, two hundred twenty-one million, two hundred one thousand, five hundred three".