21221202403 has 8 divisors (see below), whose sum is σ = 21306931920. Its totient is φ = 21135539040.

The previous prime is 21221202349. The next prime is 21221202461. The reversal of 21221202403 is 30420212212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21221202403 - 2⁹ = 21221201891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221202463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 685953 + ... + 716221.

It is an arithmetic number, because the mean of its divisors is an integer number (2663366490).

Almost surely, 2^21221202403 is an apocalyptic number.

21221202403 is a deficient number, since it is larger than the sum of its proper divisors (85729517).

21221202403 is a wasteful number, since it uses less digits than its factorization.

21221202403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33077.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21221202403 its reverse (30420212212), we get a palindrome (51641414615).

The spelling of 21221202403 in words is "twenty-one billion, two hundred twenty-one million, two hundred two thousand, four hundred three".