21221672110 has 16 divisors (see below), whose sum is σ = 38259558432. Its totient is φ = 8475213600.

The previous prime is 21221672093. The next prime is 21221672111. The reversal of 21221672110 is 1127612212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221672111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1675281 + ... + 1687900.

It is an arithmetic number, because the mean of its divisors is an integer number (2391222402).

Almost surely, 2^21221672110 is an apocalyptic number.

21221672110 is a deficient number, since it is larger than the sum of its proper divisors (17037886322).

21221672110 is a wasteful number, since it uses less digits than its factorization.

21221672110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3363819.

The product of its (nonzero) digits is 672, while the sum is 25.

The spelling of 21221672110 in words is "twenty-one billion, two hundred twenty-one million, six hundred seventy-two thousand, one hundred ten".