21477434331425 has 12 divisors (see below), whose sum is σ = 26636627163120. Its totient is φ = 17178974179920.

The previous prime is 21477434331403. The next prime is 21477434331427. The reversal of 21477434331425 is 52413343477412.

It is a de Polignac number, because none of the positive numbers 2^k-21477434331425 is a prime.

It is a super-2 number, since 2×21477434331425² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21477434331427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74184767 + ... + 74473716.

It is an arithmetic number, because the mean of its divisors is an integer number (2219718930260).

Almost surely, 2^{21477434331425} is an apocalyptic number.

21477434331425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21477434331425 is a deficient number, since it is larger than the sum of its proper divisors (5159192831695).

21477434331425 is a wasteful number, since it uses less digits than its factorization.

21477434331425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148664272 (or 148664267 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 50.

The spelling of 21477434331425 in words is "twenty-one trillion, four hundred seventy-seven billion, four hundred thirty-four million, three hundred thirty-one thousand, four hundred twenty-five".