21340414157 has 2 divisors, whose sum is σ = 21340414158. Its totient is φ = 21340414156.

The previous prime is 21340414153. The next prime is 21340414159. The reversal of 21340414157 is 75141404312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20826530596 + 513883561 = 144314^2 + 22669^2 .

It is a cyclic number.

It is not a de Polignac number, because 21340414157 - 2² = 21340414153 is a prime.

Together with 21340414159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21340414153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10670207078 + 10670207079.

It is an arithmetic number, because the mean of its divisors is an integer number (10670207079).

Almost surely, 2^21340414157 is an apocalyptic number.

It is an amenable number.

21340414157 is a deficient number, since it is larger than the sum of its proper divisors (1).

21340414157 is an equidigital number, since it uses as much as digits as its factorization.

21340414157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 32.

Adding to 21340414157 its reverse (75141404312), we get a palindrome (96481818469).

The spelling of 21340414157 in words is "twenty-one billion, three hundred forty million, four hundred fourteen thousand, one hundred fifty-seven".