21122031703 has 2 divisors, whose sum is σ = 21122031704. Its totient is φ = 21122031702.

The previous prime is 21122031653. The next prime is 21122031719. The reversal of 21122031703 is 30713022112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21122031703 is a prime.

It is a super-2 number, since 2×21122031703² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21122031743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561015851 + 10561015852.

It is an arithmetic number, because the mean of its divisors is an integer number (10561015852).

Almost surely, 2^21122031703 is an apocalyptic number.

21122031703 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122031703 is an equidigital number, since it uses as much as digits as its factorization.

21122031703 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 22.

Adding to 21122031703 its reverse (30713022112), we get a palindrome (51835053815).

The spelling of 21122031703 in words is "twenty-one billion, one hundred twenty-two million, thirty-one thousand, seven hundred three".