21221200011 has 32 divisors (see below), whose sum is σ = 33143302656. Its totient is φ = 11934272000.

The previous prime is 21221199973. The next prime is 21221200027. The reversal of 21221200011 is 11000212212.

It is not a de Polignac number, because 21221200011 - 2¹³ = 21221191819 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21221200011.

It is not an unprimeable number, because it can be changed into a prime (21221200061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 226560 + ... + 306221.

It is an arithmetic number, because the mean of its divisors is an integer number (1035728208).

Almost surely, 2^21221200011 is an apocalyptic number.

21221200011 is a deficient number, since it is larger than the sum of its proper divisors (11922102645).

21221200011 is a wasteful number, since it uses less digits than its factorization.

21221200011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532883.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21221200011 its reverse (11000212212), we get a palindrome (32221412223).

The spelling of 21221200011 in words is "twenty-one billion, two hundred twenty-one million, two hundred thousand, eleven".