21131143002 has 16 divisors (see below), whose sum is σ = 46958095680. Its totient is φ = 7043714316.

The previous prime is 21131142943. The next prime is 21131143009. The reversal of 21131143002 is 20034113112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21131143009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195658678 + ... + 195658785.

It is an arithmetic number, because the mean of its divisors is an integer number (2934880980).

Almost surely, 2^21131143002 is an apocalyptic number.

21131143002 is an abundant number, since it is smaller than the sum of its proper divisors (25826952678).

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

21131143002 is a wasteful number, since it uses less digits than its factorization.

21131143002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391317474 (or 391317468 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21131143002 its reverse (20034113112), we get a palindrome (41165256114).

The spelling of 21131143002 in words is "twenty-one billion, one hundred thirty-one million, one hundred forty-three thousand, two".