21133231012 has 24 divisors (see below), whose sum is σ = 39398891616. Its totient is φ = 9884032128.

The previous prime is 21133230991. The next prime is 21133231033. The reversal of 21133231012 is 21013233112.

It is an interprime number because it is at equal distance from previous prime (21133230991) and next prime (21133231033).

It is a super-2 number, since 2×21133231012² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 942238 + ... + 964405.

It is an arithmetic number, because the mean of its divisors is an integer number (1641620484).

Almost surely, 2^21133231012 is an apocalyptic number.

It is an amenable number.

21133231012 is a deficient number, since it is larger than the sum of its proper divisors (18265660604).

21133231012 is a wasteful number, since it uses less digits than its factorization.

21133231012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1906827 (or 1906825 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21133231012 its reverse (21013233112), we get a palindrome (42146464124).

The spelling of 21133231012 in words is "twenty-one billion, one hundred thirty-three million, two hundred thirty-one thousand, twelve".