21223007770 has 32 divisors (see below), whose sum is σ = 38828540736. Its totient is φ = 8350214400.

The previous prime is 21223007747. The next prime is 21223007801. The reversal of 21223007770 is 7770032212.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 440050 + ... + 485890.

It is an arithmetic number, because the mean of its divisors is an integer number (1213391898).

Almost surely, 2^21223007770 is an apocalyptic number.

21223007770 is a deficient number, since it is larger than the sum of its proper divisors (17605532966).

21223007770 is a wasteful number, since it uses less digits than its factorization.

21223007770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46606.

The product of its (nonzero) digits is 8232, while the sum is 31.

Adding to 21223007770 its reverse (7770032212), we get a palindrome (28993039982).

The spelling of 21223007770 in words is "twenty-one billion, two hundred twenty-three million, seven thousand, seven hundred seventy".