21221001110 has 16 divisors (see below), whose sum is σ = 38535837696. Its totient is φ = 8413281408.

The previous prime is 21221001103. The next prime is 21221001167. The reversal of 21221001110 is 1110012212.

It is a super-2 number, since 2×21221001110² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21221001091 and 21221001100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9388694 + ... + 9390953.

It is an arithmetic number, because the mean of its divisors is an integer number (2408489856).

Almost surely, 2^21221001110 is an apocalyptic number.

21221001110 is a deficient number, since it is larger than the sum of its proper divisors (17314836586).

21221001110 is a wasteful number, since it uses less digits than its factorization.

21221001110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18779767.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21221001110 its reverse (1110012212), we get a palindrome (22331013322).

The spelling of 21221001110 in words is "twenty-one billion, two hundred twenty-one million, one thousand, one hundred ten".