21114544147 has 4 divisors (see below), whose sum is σ = 21202889760. Its totient is φ = 21026198536.

The previous prime is 21114544127. The next prime is 21114544189. The reversal of 21114544147 is 74144541112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21114544147 - 2³¹ = 18967060499 is a prime.

It is a super-2 number, since 2×21114544147² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21114544127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44172448 + ... + 44172925.

It is an arithmetic number, because the mean of its divisors is an integer number (5300722440).

Almost surely, 2^21114544147 is an apocalyptic number.

21114544147 is a deficient number, since it is larger than the sum of its proper divisors (88345613).

21114544147 is an equidigital number, since it uses as much as digits as its factorization.

21114544147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88345612.

The product of its digits is 17920, while the sum is 34.

The spelling of 21114544147 in words is "twenty-one billion, one hundred fourteen million, five hundred forty-four thousand, one hundred forty-seven".