21309405410 has 16 divisors (see below), whose sum is σ = 38586614976. Its totient is φ = 8472721008.

The previous prime is 21309405391. The next prime is 21309405419. The reversal of 21309405410 is 1450490312.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21309405419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6378392 + ... + 6381731.

It is an arithmetic number, because the mean of its divisors is an integer number (2411663436).

Almost surely, 2^21309405410 is an apocalyptic number.

21309405410 is a deficient number, since it is larger than the sum of its proper divisors (17277209566).

21309405410 is a wasteful number, since it uses less digits than its factorization.

21309405410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12760297.

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

Adding to 21309405410 its reverse (1450490312), we get a palindrome (22759895722).

The spelling of 21309405410 in words is "twenty-one billion, three hundred nine million, four hundred five thousand, four hundred ten".