21534050405 has 8 divisors (see below), whose sum is σ = 29532412032. Its totient is φ = 14766205968.

The previous prime is 21534050401. The next prime is 21534050423. The reversal of 21534050405 is 50405043512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21534050405 - 2² = 21534050401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21534050401) 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, 307629257 + ... + 307629326.

It is an arithmetic number, because the mean of its divisors is an integer number (3691551504).

Almost surely, 2^21534050405 is an apocalyptic number.

It is an amenable number.

21534050405 is a deficient number, since it is larger than the sum of its proper divisors (7998361627).

21534050405 is an equidigital number, since it uses as much as digits as its factorization.

21534050405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615258595.

The product of its (nonzero) digits is 12000, while the sum is 29.

Adding to 21534050405 its reverse (50405043512), we get a palindrome (71939093917).

The spelling of 21534050405 in words is "twenty-one billion, five hundred thirty-four million, fifty thousand, four hundred five".