21254084161 has 8 divisors (see below), whose sum is σ = 21811055904. Its totient is φ = 20699962080.

The previous prime is 21254084153. The next prime is 21254084167. The reversal of 21254084161 is 16148045212.

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 21254084161 - 2³ = 21254084153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21254084167) 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, 697300 + ... + 727141.

It is an arithmetic number, because the mean of its divisors is an integer number (2726381988).

Almost surely, 2^21254084161 is an apocalyptic number.

It is an amenable number.

21254084161 is a deficient number, since it is larger than the sum of its proper divisors (556971743).

21254084161 is a wasteful number, since it uses less digits than its factorization.

21254084161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1424831.

The product of its (nonzero) digits is 15360, while the sum is 34.

The spelling of 21254084161 in words is "twenty-one billion, two hundred fifty-four million, eighty-four thousand, one hundred sixty-one".