21261620222 has 8 divisors (see below), whose sum is σ = 32992169400. Its totient is φ = 10264230424.

The previous prime is 21261620147. The next prime is 21261620243. The reversal of 21261620222 is 22202616212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21261620191 and 21261620200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183289772 + ... + 183289887.

It is an arithmetic number, because the mean of its divisors is an integer number (4124021175).

Almost surely, 2^21261620222 is an apocalyptic number.

21261620222 is a deficient number, since it is larger than the sum of its proper divisors (11730549178).

21261620222 is a wasteful number, since it uses less digits than its factorization.

21261620222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366579690.

The product of its (nonzero) digits is 2304, while the sum is 26.

The spelling of 21261620222 in words is "twenty-one billion, two hundred sixty-one million, six hundred twenty thousand, two hundred twenty-two".