21219748892 has 12 divisors (see below), whose sum is σ = 37136963136. Its totient is φ = 10609188000.

The previous prime is 21219748883. The next prime is 21219748897. The reversal of 21219748892 is 29884791212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21219748897) 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, 98609 + ... + 228392.

It is an arithmetic number, because the mean of its divisors is an integer number (3094746928).

Almost surely, 2^21219748892 is an apocalyptic number.

It is an amenable number.

21219748892 is a deficient number, since it is larger than the sum of its proper divisors (15917214244).

21219748892 is a wasteful number, since it uses less digits than its factorization.

21219748892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343228 (or 343226 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 53.

The spelling of 21219748892 in words is "twenty-one billion, two hundred nineteen million, seven hundred forty-eight thousand, eight hundred ninety-two".