21221000211 has 8 divisors (see below), whose sum is σ = 28984780944. Its totient is φ = 13802276480.

The previous prime is 21221000201. The next prime is 21221000233. The reversal of 21221000211 is 11200012212.

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 21221000211 - 2⁵ = 21221000179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221000201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86264106 + ... + 86264351.

It is an arithmetic number, because the mean of its divisors is an integer number (3623097618).

Almost surely, 2^21221000211 is an apocalyptic number.

21221000211 is a deficient number, since it is larger than the sum of its proper divisors (7763780733).

21221000211 is a wasteful number, since it uses less digits than its factorization.

21221000211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172528501.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21221000211 its reverse (11200012212), we get a palindrome (32421012423).

The spelling of 21221000211 in words is "twenty-one billion, two hundred twenty-one million, two hundred eleven", and thus it is an aban number.