21140020342 has 32 divisors (see below), whose sum is σ = 36499276800. Its totient is φ = 8995393440.

The previous prime is 21140020289. The next prime is 21140020379. The reversal of 21140020342 is 24302004112.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1348992 + ... + 1364572.

It is an arithmetic number, because the mean of its divisors is an integer number (1140602400).

Almost surely, 2^21140020342 is an apocalyptic number.

21140020342 is a deficient number, since it is larger than the sum of its proper divisors (15359256458).

21140020342 is a wasteful number, since it uses less digits than its factorization.

21140020342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16276.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21140020342 its reverse (24302004112), we get a palindrome (45442024454).

The spelling of 21140020342 in words is "twenty-one billion, one hundred forty million, twenty thousand, three hundred forty-two".