21031002121232 has 80 divisors (see below), whose sum is σ = 41903551892400. Its totient is φ = 10217934397440.

The previous prime is 21031002121187. The next prime is 21031002121243. The reversal of 21031002121232 is 23212120013012.

It can be written as a sum of positive squares in 8 ways, for example, as 648630501376 + 20382371619856 = 805376^2 + 4514684^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1694812244 + ... + 1694824652.

It is an arithmetic number, because the mean of its divisors is an integer number (523794398655).

Almost surely, 2^{21031002121232} is an apocalyptic number.

It is an amenable number.

21031002121232 is a deficient number, since it is larger than the sum of its proper divisors (20872549771168).

21031002121232 is a wasteful number, since it uses less digits than its factorization.

21031002121232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15964 (or 15958 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21031002121232 its reverse (23212120013012), we get a palindrome (44243122134244).

The spelling of 21031002121232 in words is "twenty-one trillion, thirty-one billion, two million, one hundred twenty-one thousand, two hundred thirty-two".