21033321131 has 2 divisors, whose sum is σ = 21033321132. Its totient is φ = 21033321130.

The previous prime is 21033321107. The next prime is 21033321149. The reversal of 21033321131 is 13112333012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21033321131 - 2²² = 21029126827 is a prime.

It is a super-2 number, since 2×21033321131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21033021131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516660565 + 10516660566.

It is an arithmetic number, because the mean of its divisors is an integer number (10516660566).

Almost surely, 2^21033321131 is an apocalyptic number.

21033321131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033321131 is an equidigital number, since it uses as much as digits as its factorization.

21033321131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21033321131 its reverse (13112333012), we get a palindrome (34145654143).

The spelling of 21033321131 in words is "twenty-one billion, thirty-three million, three hundred twenty-one thousand, one hundred thirty-one".