21405160427 has 16 divisors (see below), whose sum is σ = 25575559680. Its totient is φ = 17515948032.

The previous prime is 21405160421. The next prime is 21405160433. The reversal of 21405160427 is 72406150412.

It is an interprime number because it is at equal distance from previous prime (21405160421) and next prime (21405160433).

It is a cyclic number.

It is not a de Polignac number, because 21405160427 - 2¹⁸ = 21404898283 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21405160393 and 21405160402.

It is not an unprimeable number, because it can be changed into a prime (21405160421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42902 + ... + 211307.

It is an arithmetic number, because the mean of its divisors is an integer number (1598472480).

Almost surely, 2^21405160427 is an apocalyptic number.

21405160427 is a deficient number, since it is larger than the sum of its proper divisors (4170399253).

21405160427 is a wasteful number, since it uses less digits than its factorization.

21405160427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254762.

The product of its (nonzero) digits is 13440, while the sum is 32.

The spelling of 21405160427 in words is "twenty-one billion, four hundred five million, one hundred sixty thousand, four hundred twenty-seven".