21340379242 has 64 divisors (see below), whose sum is σ = 41757133824. Its totient is φ = 7937740800.

The previous prime is 21340379197. The next prime is 21340379251. The reversal of 21340379242 is 24297304312.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3713023 + ... + 3718765.

It is an arithmetic number, because the mean of its divisors is an integer number (652455216).

Almost surely, 2^21340379242 is an apocalyptic number.

21340379242 is a deficient number, since it is larger than the sum of its proper divisors (20416754582).

21340379242 is a wasteful number, since it uses less digits than its factorization.

21340379242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6983.

The product of its (nonzero) digits is 72576, while the sum is 37.

The spelling of 21340379242 in words is "twenty-one billion, three hundred forty million, three hundred seventy-nine thousand, two hundred forty-two".