21043131144402 has 32 divisors (see below), whose sum is σ = 42124540078080. Its totient is φ = 7007997916800.

The previous prime is 21043131144391. The next prime is 21043131144419. The reversal of 21043131144402 is 20444113134012.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21043131144402.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 233578038 + ... + 233668110.

It is an arithmetic number, because the mean of its divisors is an integer number (1316391877440).

Almost surely, 2^{21043131144402} is an apocalyptic number.

21043131144402 is an abundant number, since it is smaller than the sum of its proper divisors (21081408933678).

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

21043131144402 is a wasteful number, since it uses less digits than its factorization.

21043131144402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125058.

The product of its (nonzero) digits is 9216, while the sum is 30.

Adding to 21043131144402 its reverse (20444113134012), we get a palindrome (41487244278414).

The spelling of 21043131144402 in words is "twenty-one trillion, forty-three billion, one hundred thirty-one million, one hundred forty-four thousand, four hundred two".