21221265303 has 24 divisors (see below), whose sum is σ = 36571797360. Its totient is φ = 12126436560.

The previous prime is 21221265211. The next prime is 21221265313. The reversal of 21221265303 is 30356212212.

It is a happy number.

21221265303 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 1 + 2 + 653 + 0 + 3 = 666.

It is not a de Polignac number, because 21221265303 - 2¹⁶ = 21221199767 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221265313) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8018808 + ... + 8021453.

It is an arithmetic number, because the mean of its divisors is an integer number (1523824890).

Almost surely, 2^21221265303 is an apocalyptic number.

21221265303 is a deficient number, since it is larger than the sum of its proper divisors (15350532057).

21221265303 is a wasteful number, since it uses less digits than its factorization.

21221265303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16040284 (or 16040271 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 21221265303 its reverse (30356212212), we get a palindrome (51577477515).

The spelling of 21221265303 in words is "twenty-one billion, two hundred twenty-one million, two hundred sixty-five thousand, three hundred three".