21343401487 has 2 divisors, whose sum is σ = 21343401488. Its totient is φ = 21343401486.

The previous prime is 21343401473. The next prime is 21343401491. The reversal of 21343401487 is 78410434312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21343401487 - 2²³ = 21335012879 is a prime.

It is a super-2 number, since 2×21343401487² (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 (21343401187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671700743 + 10671700744.

It is an arithmetic number, because the mean of its divisors is an integer number (10671700744).

Almost surely, 2^21343401487 is an apocalyptic number.

21343401487 is a deficient number, since it is larger than the sum of its proper divisors (1).

21343401487 is an equidigital number, since it uses as much as digits as its factorization.

21343401487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 37.

Adding to 21343401487 its reverse (78410434312), we get a palindrome (99753835799).

The spelling of 21343401487 in words is "twenty-one billion, three hundred forty-three million, four hundred one thousand, four hundred eighty-seven".