21134426213 has 2 divisors, whose sum is σ = 21134426214. Its totient is φ = 21134426212.

The previous prime is 21134426191. The next prime is 21134426219. The reversal of 21134426213 is 31262443112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20591676004 + 542750209 = 143498^2 + 23297^2 .

It is a cyclic number.

It is not a de Polignac number, because 21134426213 - 2²² = 21130231909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21134426219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10567213106 + 10567213107.

It is an arithmetic number, because the mean of its divisors is an integer number (10567213107).

Almost surely, 2^21134426213 is an apocalyptic number.

It is an amenable number.

21134426213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21134426213 is an equidigital number, since it uses as much as digits as its factorization.

21134426213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 29.

Adding to 21134426213 its reverse (31262443112), we get a palindrome (52396869325).

The spelling of 21134426213 in words is "twenty-one billion, one hundred thirty-four million, four hundred twenty-six thousand, two hundred thirteen".