21221211302 has 8 divisors (see below), whose sum is σ = 33507175800. Its totient is φ = 10052152704.

The previous prime is 21221211247. The next prime is 21221211317. The reversal of 21221211302 is 20311212212.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 279226427 + ... + 279226502.

It is an arithmetic number, because the mean of its divisors is an integer number (4188396975).

Almost surely, 2^21221211302 is an apocalyptic number.

21221211302 is a deficient number, since it is larger than the sum of its proper divisors (12285964498).

21221211302 is a wasteful number, since it uses less digits than its factorization.

21221211302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558452950.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21221211302 its reverse (20311212212), we get a palindrome (41532423514).

The spelling of 21221211302 in words is "twenty-one billion, two hundred twenty-one million, two hundred eleven thousand, three hundred two".