21142120388 has 24 divisors (see below), whose sum is σ = 37392147744. Its totient is φ = 10458720000.

The previous prime is 21142120387. The next prime is 21142120411. The reversal of 21142120388 is 88302124112.

It is not an unprimeable number, because it can be changed into a prime (21142120387) 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 7 ways as a sum of consecutive naturals, for example, 1565063 + ... + 1578513.

It is an arithmetic number, because the mean of its divisors is an integer number (1558006156).

Almost surely, 2^21142120388 is an apocalyptic number.

It is an amenable number.

21142120388 is a deficient number, since it is larger than the sum of its proper divisors (16250027356).

21142120388 is a wasteful number, since it uses less digits than its factorization.

21142120388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17603 (or 17601 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The spelling of 21142120388 in words is "twenty-one billion, one hundred forty-two million, one hundred twenty thousand, three hundred eighty-eight".