21012230343042 has 32 divisors (see below), whose sum is σ = 46695661017600. Its totient is φ = 7003804409424.

The previous prime is 21012230343037. The next prime is 21012230343077. The reversal of 21012230343042 is 24034303221012.

21012230343042 is a `hidden beast` number, since 2 + 1 + 0 + 1 + 223 + 0 + 3 + 430 + 4 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21012230342997 and 21012230343015.

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, 6162013 + ... + 8943984.

It is an arithmetic number, because the mean of its divisors is an integer number (1459239406800).

Almost surely, 2^{21012230343042} is an apocalyptic number.

21012230343042 is an abundant number, since it is smaller than the sum of its proper divisors (25683430674558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21012230343042 is a wasteful number, since it uses less digits than its factorization.

21012230343042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15131767 (or 15131761 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21012230343042 its reverse (24034303221012), we get a palindrome (45046533564054).

The spelling of 21012230343042 in words is "twenty-one trillion, twelve billion, two hundred thirty million, three hundred forty-three thousand, forty-two".