21341540009 has 2 divisors, whose sum is σ = 21341540010. Its totient is φ = 21341540008.

The previous prime is 21341539991. The next prime is 21341540113. The reversal of 21341540009 is 90004514312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21249475984 + 92064025 = 145772^2 + 9595^2 .

It is a cyclic number.

It is not a de Polignac number, because 21341540009 - 2⁸ = 21341539753 is a prime.

It is a super-2 number, since 2×21341540009² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21341500009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10670770004 + 10670770005.

It is an arithmetic number, because the mean of its divisors is an integer number (10670770005).

Almost surely, 2^21341540009 is an apocalyptic number.

It is an amenable number.

21341540009 is a deficient number, since it is larger than the sum of its proper divisors (1).

21341540009 is an equidigital number, since it uses as much as digits as its factorization.

21341540009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 21341540009 in words is "twenty-one billion, three hundred forty-one million, five hundred forty thousand, nine".