21002002209974 has 16 divisors (see below), whose sum is σ = 31520572991856. Its totient is φ = 10495145421600.

The previous prime is 21002002209971. The next prime is 21002002209977. The reversal of 21002002209974 is 47990220020012.

It is an interprime number because it is at equal distance from previous prime (21002002209971) and next prime (21002002209977).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002002209971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49316684 + ... + 49740720.

It is an arithmetic number, because the mean of its divisors is an integer number (1970035811991).

Almost surely, 2^{21002002209974} is an apocalyptic number.

21002002209974 is a deficient number, since it is larger than the sum of its proper divisors (10518570781882).

21002002209974 is a wasteful number, since it uses less digits than its factorization.

21002002209974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437791.

The product of its (nonzero) digits is 36288, while the sum is 38.

Adding to 21002002209974 its reverse (47990220020012), we get a palindrome (68992222229986).

The spelling of 21002002209974 in words is "twenty-one trillion, two billion, two million, two hundred nine thousand, nine hundred seventy-four".