21002223031 has 2 divisors, whose sum is σ = 21002223032. Its totient is φ = 21002223030.

The previous prime is 21002223019. The next prime is 21002223037. The reversal of 21002223031 is 13032220012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21002223031 - 2²⁷ = 20868005303 is a prime.

It is a super-2 number, since 2×21002223031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21002222996 and 21002223014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21002223037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501111515 + 10501111516.

It is an arithmetic number, because the mean of its divisors is an integer number (10501111516).

Almost surely, 2^21002223031 is an apocalyptic number.

21002223031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002223031 is an equidigital number, since it uses as much as digits as its factorization.

21002223031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21002223031 its reverse (13032220012), we get a palindrome (34034443043).

The spelling of 21002223031 in words is "twenty-one billion, two million, two hundred twenty-three thousand, thirty-one".