21002012331974 has 8 divisors (see below), whose sum is σ = 31505564645040. Its totient is φ = 10500157450296.

The previous prime is 21002012331973. The next prime is 21002012332013. The reversal of 21002012331974 is 47913321020012.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002012331973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 424326914 + ... + 424376405.

It is an arithmetic number, because the mean of its divisors is an integer number (3938195580630).

Almost surely, 2^{21002012331974} is an apocalyptic number.

21002012331974 is a deficient number, since it is larger than the sum of its proper divisors (10503552313066).

21002012331974 is a wasteful number, since it uses less digits than its factorization.

21002012331974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848715694.

The product of its (nonzero) digits is 18144, while the sum is 35.

Adding to 21002012331974 its reverse (47913321020012), we get a palindrome (68915333351986).

The spelling of 21002012331974 in words is "twenty-one trillion, two billion, twelve million, three hundred thirty-one thousand, nine hundred seventy-four".