21212075404742 has 8 divisors (see below), whose sum is σ = 31821412743336. Its totient is φ = 10604937823632.

The previous prime is 21212075404739. The next prime is 21212075404777. The reversal of 21212075404742 is 24740457021212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21212075404742.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 549915263 + ... + 549953834.

It is an arithmetic number, because the mean of its divisors is an integer number (3977676592917).

Almost surely, 2^{21212075404742} is an apocalyptic number.

21212075404742 is a deficient number, since it is larger than the sum of its proper divisors (10609337338594).

21212075404742 is a wasteful number, since it uses less digits than its factorization.

21212075404742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099878742.

The product of its (nonzero) digits is 250880, while the sum is 41.

The spelling of 21212075404742 in words is "twenty-one trillion, two hundred twelve billion, seventy-five million, four hundred four thousand, seven hundred forty-two".