21142338148 has 24 divisors (see below), whose sum is σ = 38426958080. Its totient is φ = 10167392160.

The previous prime is 21142338073. The next prime is 21142338149. The reversal of 21142338148 is 84183324112.

It is not an unprimeable number, because it can be changed into a prime (21142338149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 502803 + ... + 543226.

Almost surely, 2^21142338148 is an apocalyptic number.

It is an amenable number.

21142338148 is a deficient number, since it is larger than the sum of its proper divisors (17284619932).

21142338148 is a wasteful number, since it uses less digits than its factorization.

21142338148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046227 (or 1046225 counting only the distinct ones).

The product of its digits is 36864, while the sum is 37.

It can be divided in two parts, 211423 and 38148, that added together give a triangular number (249571 = T₇₀₆).

The spelling of 21142338148 in words is "twenty-one billion, one hundred forty-two million, three hundred thirty-eight thousand, one hundred forty-eight".