21221012201011 has 4 divisors (see below), whose sum is σ = 24252585372592. Its totient is φ = 18189439029432.

The previous prime is 21221012201003. The next prime is 21221012201021. The reversal of 21221012201011 is 11010221012212.

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

It is a cyclic number.

It is not a de Polignac number, because 21221012201011 - 2³ = 21221012201003 is a prime.

It is a super-3 number, since 3×21221012201011³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221012201021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1515786585780 + ... + 1515786585793.

It is an arithmetic number, because the mean of its divisors is an integer number (6063146343148).

Almost surely, 2^{21221012201011} is an apocalyptic number.

21221012201011 is a deficient number, since it is larger than the sum of its proper divisors (3031573171581).

21221012201011 is an equidigital number, since it uses as much as digits as its factorization.

21221012201011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3031573171580.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21221012201011 its reverse (11010221012212), we get a palindrome (32231233213223).

The spelling of 21221012201011 in words is "twenty-one trillion, two hundred twenty-one billion, twelve million, two hundred one thousand, eleven".