21223201670 has 64 divisors (see below), whose sum is σ = 42301016640. Its totient is φ = 7601817600.

The previous prime is 21223201589. The next prime is 21223201687. The reversal of 21223201670 is 7610232212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9064700 + ... + 9067040.

It is an arithmetic number, because the mean of its divisors is an integer number (660953385).

Almost surely, 2^21223201670 is an apocalyptic number.

21223201670 is a deficient number, since it is larger than the sum of its proper divisors (21077814970).

21223201670 is a wasteful number, since it uses less digits than its factorization.

21223201670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3561.

The product of its (nonzero) digits is 2016, while the sum is 26.

Adding to 21223201670 its reverse (7610232212), we get a palindrome (28833433882).

The spelling of 21223201670 in words is "twenty-one billion, two hundred twenty-three million, two hundred one thousand, six hundred seventy".