21021201122211 has 24 divisors (see below), whose sum is σ = 32897748414960. Its totient is φ = 12883034336256.

The previous prime is 21021201122179. The next prime is 21021201122221. The reversal of 21021201122211 is 11222110212012.

21021201122211 is a `hidden beast` number, since 210 + 2 + 120 + 1 + 122 + 211 = 666.

It is not a de Polignac number, because 21021201122211 - 2⁵ = 21021201122179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21021201122221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1597591926 + ... + 1597605083.

It is an arithmetic number, because the mean of its divisors is an integer number (1370739517290).

Almost surely, 2^{21021201122211} is an apocalyptic number.

21021201122211 is a deficient number, since it is larger than the sum of its proper divisors (11876547292749).

21021201122211 is a wasteful number, since it uses less digits than its factorization.

21021201122211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3195197075 (or 3195197072 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21021201122211 its reverse (11222110212012), we get a palindrome (32243311334223).

The spelling of 21021201122211 in words is "twenty-one trillion, twenty-one billion, two hundred one million, one hundred twenty-two thousand, two hundred eleven".