21475144345 has 32 divisors (see below), whose sum is σ = 28868400000. Its totient is φ = 15240508416.

The previous prime is 21475144343. The next prime is 21475144391. The reversal of 21475144345 is 54344157412.

It is a cyclic number.

It is not a de Polignac number, because 21475144345 - 2¹ = 21475144343 is a prime.

It is a super-2 number, since 2×21475144345² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21475144298 and 21475144307.

It is not an unprimeable number, because it can be changed into a prime (21475144343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 284406 + ... + 351904.

It is an arithmetic number, because the mean of its divisors is an integer number (902137500).

Almost surely, 2^21475144345 is an apocalyptic number.

It is an amenable number.

21475144345 is a deficient number, since it is larger than the sum of its proper divisors (7393255655).

21475144345 is a wasteful number, since it uses less digits than its factorization.

21475144345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67737.

The product of its digits is 268800, while the sum is 40.

The spelling of 21475144345 in words is "twenty-one billion, four hundred seventy-five million, one hundred forty-four thousand, three hundred forty-five".