21001110209974 has 16 divisors (see below), whose sum is σ = 31602514050000. Its totient is φ = 10466941951584.

The previous prime is 21001110209951. The next prime is 21001110209983. The reversal of 21001110209974 is 47990201110012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13020652 + ... + 14544400.

It is an arithmetic number, because the mean of its divisors is an integer number (1975157128125).

Almost surely, 2^{21001110209974} is an apocalyptic number.

21001110209974 is a deficient number, since it is larger than the sum of its proper divisors (10601403840026).

21001110209974 is a wasteful number, since it uses less digits than its factorization.

21001110209974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545807.

The product of its (nonzero) digits is 9072, while the sum is 37.

Adding to 21001110209974 its reverse (47990201110012), we get a palindrome (68991311319986).

The spelling of 21001110209974 in words is "twenty-one trillion, one billion, one hundred ten million, two hundred nine thousand, nine hundred seventy-four".