21403233331 has 2 divisors, whose sum is σ = 21403233332. Its totient is φ = 21403233330.

The previous prime is 21403233307. The next prime is 21403233337. The reversal of 21403233331 is 13333230412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21403233331 - 2¹³ = 21403225139 is a prime.

It is a super-2 number, since 2×21403233331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21403233296 and 21403233305.

It is not a weakly prime, because it can be changed into another prime (21403233337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10701616665 + 10701616666.

It is an arithmetic number, because the mean of its divisors is an integer number (10701616666).

Almost surely, 2^21403233331 is an apocalyptic number.

21403233331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21403233331 is an equidigital number, since it uses as much as digits as its factorization.

21403233331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 25.

Adding to 21403233331 its reverse (13333230412), we get a palindrome (34736463743).

The spelling of 21403233331 in words is "twenty-one billion, four hundred three million, two hundred thirty-three thousand, three hundred thirty-one".