21222233661 has 8 divisors (see below), whose sum is σ = 28444460544. Its totient is φ = 14074081280.

The previous prime is 21222233579. The next prime is 21222233707. The reversal of 21222233661 is 16633222212.

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

It is a cyclic number.

It is not a de Polignac number, because 21222233661 - 2¹⁵ = 21222200893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221233661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18517956 + ... + 18519101.

It is an arithmetic number, because the mean of its divisors is an integer number (3555557568).

Almost surely, 2^21222233661 is an apocalyptic number.

It is an amenable number.

21222233661 is a deficient number, since it is larger than the sum of its proper divisors (7222226883).

21222233661 is a wasteful number, since it uses less digits than its factorization.

21222233661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37037251.

The product of its digits is 10368, while the sum is 30.

Adding to 21222233661 its reverse (16633222212), we get a palindrome (37855455873).

The spelling of 21222233661 in words is "twenty-one billion, two hundred twenty-two million, two hundred thirty-three thousand, six hundred sixty-one".