21468535449 has 16 divisors (see below), whose sum is σ = 28914268032. Its totient is φ = 14167692288.

The previous prime is 21468535447. The next prime is 21468535453. The reversal of 21468535449 is 94453586412.

It is a happy number.

It is not a de Polignac number, because 21468535449 - 2¹ = 21468535447 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21468535447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 838059 + ... + 863295.

It is an arithmetic number, because the mean of its divisors is an integer number (1807141752).

Almost surely, 2^21468535449 is an apocalyptic number.

It is an amenable number.

21468535449 is a deficient number, since it is larger than the sum of its proper divisors (7445732583).

21468535449 is a wasteful number, since it uses less digits than its factorization.

21468535449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28096.

The product of its digits is 4147200, while the sum is 51.

The spelling of 21468535449 in words is "twenty-one billion, four hundred sixty-eight million, five hundred thirty-five thousand, four hundred forty-nine".