21354161005 has 8 divisors (see below), whose sum is σ = 25629709824. Its totient is φ = 17080184400.

The previous prime is 21354160999. The next prime is 21354161011. The reversal of 21354161005 is 50016145312.

It is an interprime number because it is at equal distance from previous prime (21354160999) and next prime (21354161011).

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

It is not a de Polignac number, because 21354161005 - 2⁹ = 21354160493 is a prime.

It is a super-2 number, since 2×21354161005² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362961 + ... + 417670.

It is an arithmetic number, because the mean of its divisors is an integer number (3203713728).

Almost surely, 2^21354161005 is an apocalyptic number.

It is an amenable number.

21354161005 is a deficient number, since it is larger than the sum of its proper divisors (4275548819).

21354161005 is an equidigital number, since it uses as much as digits as its factorization.

21354161005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786107.

The product of its (nonzero) digits is 3600, while the sum is 28.

The spelling of 21354161005 in words is "twenty-one billion, three hundred fifty-four million, one hundred sixty-one thousand, five".