21221400011 has 8 divisors (see below), whose sum is σ = 24254688480. Its totient is φ = 18188526528.

The previous prime is 21221399981. The next prime is 21221400017. The reversal of 21221400011 is 11000412212.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21221400011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221400017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14885 + ... + 206553.

It is an arithmetic number, because the mean of its divisors is an integer number (3031836060).

Almost surely, 2^21221400011 is an apocalyptic number.

21221400011 is a deficient number, since it is larger than the sum of its proper divisors (3033288469).

21221400011 is a wasteful number, since it uses less digits than its factorization.

21221400011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207493.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21221400011 its reverse (11000412212), we get a palindrome (32221812223).

The spelling of 21221400011 in words is "twenty-one billion, two hundred twenty-one million, four hundred thousand, eleven".