21221011100211 has 48 divisors (see below), whose sum is σ = 30670536948480. Its totient is φ = 13045487495040.

The previous prime is 21221011100189. The next prime is 21221011100227. The reversal of 21221011100211 is 11200111012212.

It is a happy number.

It is not a de Polignac number, because 21221011100211 - 2²¹ = 21221009003059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221011100011) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2795545026 + ... + 2795552616.

It is an arithmetic number, because the mean of its divisors is an integer number (638969519760).

Almost surely, 2^{21221011100211} is an apocalyptic number.

21221011100211 is a deficient number, since it is larger than the sum of its proper divisors (9449525848269).

21221011100211 is a wasteful number, since it uses less digits than its factorization.

21221011100211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12636 (or 12623 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21221011100211 its reverse (11200111012212), we get a palindrome (32421122112423).

The spelling of 21221011100211 in words is "twenty-one trillion, two hundred twenty-one billion, eleven million, one hundred thousand, two hundred eleven".