21375567351 has 12 divisors (see below), whose sum is σ = 30931259112. Its totient is φ = 14224790736.

The previous prime is 21375567349. The next prime is 21375567377. The reversal of 21375567351 is 15376557312.

21375567351 is a `hidden beast` number, since 2 + 1 + 37 + 5 + 567 + 3 + 51 = 666.

It is not a de Polignac number, because 21375567351 - 2¹ = 21375567349 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21375567297 and 21375567306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21375567391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2127001 + ... + 2137026.

It is an arithmetic number, because the mean of its divisors is an integer number (2577604926).

Almost surely, 2^21375567351 is an apocalyptic number.

21375567351 is a deficient number, since it is larger than the sum of its proper divisors (9555691761).

21375567351 is a wasteful number, since it uses less digits than its factorization.

21375567351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4264590 (or 4264587 counting only the distinct ones).

The product of its digits is 661500, while the sum is 45.

The spelling of 21375567351 in words is "twenty-one billion, three hundred seventy-five million, five hundred sixty-seven thousand, three hundred fifty-one".