21033333131 has 16 divisors (see below), whose sum is σ = 21826020480. Its totient is φ = 20252903040.

The previous prime is 21033333119. The next prime is 21033333137. The reversal of 21033333131 is 13133333012.

It is a cyclic number.

It is not a de Polignac number, because 21033333131 - 2⁶ = 21033333067 is a prime.

It is a super-2 number, since 2×21033333131² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21033333097 and 21033333106.

It is not an unprimeable number, because it can be changed into a prime (21033333137) 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 15 ways as a sum of consecutive naturals, for example, 4018286 + ... + 4023516.

It is an arithmetic number, because the mean of its divisors is an integer number (1364126280).

Almost surely, 2^21033333131 is an apocalyptic number.

21033333131 is a deficient number, since it is larger than the sum of its proper divisors (792687349).

21033333131 is a wasteful number, since it uses less digits than its factorization.

21033333131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6374.

The product of its (nonzero) digits is 1458, while the sum is 23.

Adding to 21033333131 its reverse (13133333012), we get a palindrome (34166666143).

The spelling of 21033333131 in words is "twenty-one billion, thirty-three million, three hundred thirty-three thousand, one hundred thirty-one".