21402341505 has 48 divisors (see below), whose sum is σ = 40418490240. Its totient is φ = 10743116544.

The previous prime is 21402341497. The next prime is 21402341507. The reversal of 21402341505 is 50514320412.

It is not a de Polignac number, because 21402341505 - 2³ = 21402341497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21402341507) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 235269 + ... + 313298.

It is an arithmetic number, because the mean of its divisors is an integer number (842051880).

Almost surely, 2^21402341505 is an apocalyptic number.

It is an amenable number.

21402341505 is a deficient number, since it is larger than the sum of its proper divisors (19016148735).

21402341505 is a wasteful number, since it uses less digits than its factorization.

21402341505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548615 (or 548592 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 21402341505 its reverse (50514320412), we get a palindrome (71916661917).

The spelling of 21402341505 in words is "twenty-one billion, four hundred two million, three hundred forty-one thousand, five hundred five".