21221111302 has 4 divisors (see below), whose sum is σ = 31831666956. Its totient is φ = 10610555650.

The previous prime is 21221111291. The next prime is 21221111363. The reversal of 21221111302 is 20311112212.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305277824 + ... + 5305277827.

It is an arithmetic number, because the mean of its divisors is an integer number (7957916739).

Almost surely, 2^21221111302 is an apocalyptic number.

21221111302 is a deficient number, since it is larger than the sum of its proper divisors (10610555654).

21221111302 is a wasteful number, since it uses less digits than its factorization.

21221111302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10610555653.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21221111302 its reverse (20311112212), we get a palindrome (41532223514).

The spelling of 21221111302 in words is "twenty-one billion, two hundred twenty-one million, one hundred eleven thousand, three hundred two".