21221021201211 has 16 divisors (see below), whose sum is σ = 33856899922720. Its totient is φ = 13059089969760.

The previous prime is 21221021201183. The next prime is 21221021201231. The reversal of 21221021201211 is 11210212012212.

21221021201211 is a `hidden beast` number, since 21 + 2 + 210 + 21 + 201 + 211 = 666.

It is not a de Polignac number, because 21221021201211 - 2⁵ = 21221021201179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221021201231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30229374580 + ... + 30229375281.

It is an arithmetic number, because the mean of its divisors is an integer number (2116056245170).

Almost surely, 2^{21221021201211} is an apocalyptic number.

21221021201211 is a deficient number, since it is larger than the sum of its proper divisors (12635878721509).

21221021201211 is a wasteful number, since it uses less digits than its factorization.

21221021201211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60458749883 (or 60458749877 counting only the distinct ones).

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

Adding to 21221021201211 its reverse (11210212012212), we get a palindrome (32431233213423).

The spelling of 21221021201211 in words is "twenty-one trillion, two hundred twenty-one billion, twenty-one million, two hundred one thousand, two hundred eleven".