21375374473 has 8 divisors (see below), whose sum is σ = 22636622880. Its totient is φ = 20114556480.

The previous prime is 21375374467. The next prime is 21375374569. The reversal of 21375374473 is 37447357312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21375374473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21375374443) 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, 2403 + ... + 206776.

It is an arithmetic number, because the mean of its divisors is an integer number (2829577860).

Almost surely, 2^21375374473 is an apocalyptic number.

It is an amenable number.

21375374473 is a deficient number, since it is larger than the sum of its proper divisors (1261248407).

21375374473 is a wasteful number, since it uses less digits than its factorization.

21375374473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215207.

The product of its digits is 1481760, while the sum is 46.

The spelling of 21375374473 in words is "twenty-one billion, three hundred seventy-five million, three hundred seventy-four thousand, four hundred seventy-three".