21343135031 has 2 divisors, whose sum is σ = 21343135032. Its totient is φ = 21343135030.

The previous prime is 21343135003. The next prime is 21343135057. The reversal of 21343135031 is 13053134312.

It is an a-pointer prime, because the next prime (21343135057) can be obtained adding 21343135031 to its sum of digits (26).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21343135031 is a prime.

It is a super-2 number, since 2×21343135031² (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 (21343135001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671567515 + 10671567516.

It is an arithmetic number, because the mean of its divisors is an integer number (10671567516).

Almost surely, 2^21343135031 is an apocalyptic number.

21343135031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21343135031 is an equidigital number, since it uses as much as digits as its factorization.

21343135031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 26.

Adding to 21343135031 its reverse (13053134312), we get a palindrome (34396269343).

The spelling of 21343135031 in words is "twenty-one billion, three hundred forty-three million, one hundred thirty-five thousand, thirty-one".