21220443148 has 6 divisors (see below), whose sum is σ = 37135775516. Its totient is φ = 10610221572.

The previous prime is 21220443143. The next prime is 21220443163. The reversal of 21220443148 is 84134402212.

It is not an unprimeable number, because it can be changed into a prime (21220443143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2652555390 + ... + 2652555397.

Almost surely, 2^21220443148 is an apocalyptic number.

It is an amenable number.

21220443148 is a deficient number, since it is larger than the sum of its proper divisors (15915332368).

21220443148 is a wasteful number, since it uses less digits than its factorization.

21220443148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5305110791 (or 5305110789 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 31.

The spelling of 21220443148 in words is "twenty-one billion, two hundred twenty million, four hundred forty-three thousand, one hundred forty-eight".