21767120204 has 12 divisors (see below), whose sum is σ = 38114202504. Its totient is φ = 10877348064.

The previous prime is 21767120203. The next prime is 21767120227. The reversal of 21767120204 is 40202176712.

It is not an unprimeable number, because it can be changed into a prime (21767120201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1545122 + ... + 1559145.

It is an arithmetic number, because the mean of its divisors is an integer number (3176183542).

Almost surely, 2^21767120204 is an apocalyptic number.

It is an amenable number.

21767120204 is a deficient number, since it is larger than the sum of its proper divisors (16347082300).

21767120204 is a wasteful number, since it uses less digits than its factorization.

21767120204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3106024 (or 3106022 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

Adding to 21767120204 its reverse (40202176712), we get a palindrome (61969296916).

The spelling of 21767120204 in words is "twenty-one billion, seven hundred sixty-seven million, one hundred twenty thousand, two hundred four".