21942238132 has 6 divisors (see below), whose sum is σ = 38398916738. Its totient is φ = 10971119064.

The previous prime is 21942238121. The next prime is 21942238139. The reversal of 21942238132 is 23183224912.

It can be written as a sum of positive squares in only one way, i.e., 20562412816 + 1379825316 = 143396^2 + 37146^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21942238091 and 21942238100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21942238139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2742779763 + ... + 2742779770.

Almost surely, 2^21942238132 is an apocalyptic number.

It is an amenable number.

21942238132 is a deficient number, since it is larger than the sum of its proper divisors (16456678606).

21942238132 is a wasteful number, since it uses less digits than its factorization.

21942238132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5485559537 (or 5485559535 counting only the distinct ones).

The product of its digits is 41472, while the sum is 37.

The spelling of 21942238132 in words is "twenty-one billion, nine hundred forty-two million, two hundred thirty-eight thousand, one hundred thirty-two".