21221132297 has 4 divisors (see below), whose sum is σ = 21221769936. Its totient is φ = 21220494660.

The previous prime is 21221132201. The next prime is 21221132311. The reversal of 21221132297 is 79223112212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21221132297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221132797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265979 + ... + 336432.

It is an arithmetic number, because the mean of its divisors is an integer number (5305442484).

Almost surely, 2^21221132297 is an apocalyptic number.

It is an amenable number.

21221132297 is a deficient number, since it is larger than the sum of its proper divisors (637639).

21221132297 is an equidigital number, since it uses as much as digits as its factorization.

21221132297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637638.

The product of its digits is 6048, while the sum is 32.

The spelling of 21221132297 in words is "twenty-one billion, two hundred twenty-one million, one hundred thirty-two thousand, two hundred ninety-seven".