21321011431472 has 40 divisors (see below), whose sum is σ = 42069111581616. Its totient is φ = 10465552601856.

The previous prime is 21321011431471. The next prime is 21321011431519. The reversal of 21321011431472 is 27413411012312.

It is not an unprimeable number, because it can be changed into a prime (21321011431471) 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, 33626183 + ... + 34254374.

Almost surely, 2^{21321011431472} is an apocalyptic number.

It is an amenable number.

21321011431472 is a deficient number, since it is larger than the sum of its proper divisors (20748100150144).

21321011431472 is a wasteful number, since it uses less digits than its factorization.

21321011431472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67880925 (or 67880919 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

Adding to 21321011431472 its reverse (27413411012312), we get a palindrome (48734422443784).

The spelling of 21321011431472 in words is "twenty-one trillion, three hundred twenty-one billion, eleven million, four hundred thirty-one thousand, four hundred seventy-two".