21221112021011 has 8 divisors (see below), whose sum is σ = 24252745549824. Its totient is φ = 18189490016520.

The previous prime is 21221112020903. The next prime is 21221112021041. The reversal of 21221112021011 is 11012021112212.

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-21221112021011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221112021041) 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, 1511246 + ... + 6687756.

It is an arithmetic number, because the mean of its divisors is an integer number (3031593193728).

Almost surely, 2^{21221112021011} is an apocalyptic number.

21221112021011 is a deficient number, since it is larger than the sum of its proper divisors (3031633528813).

21221112021011 is an equidigital number, since it uses as much as digits as its factorization.

21221112021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5762161.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21221112021011 its reverse (11012021112212), we get a palindrome (32233133133223).

The spelling of 21221112021011 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twelve million, twenty-one thousand, eleven".