21154366347 has 64 divisors (see below), whose sum is σ = 31660554240. Its totient is φ = 12504416256.

The previous prime is 21154366249. The next prime is 21154366367. The reversal of 21154366347 is 74366345112.

It is not a de Polignac number, because 21154366347 - 2¹¹ = 21154364299 is a prime.

It is a super-2 number, since 2×21154366347² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21154366299 and 21154366308.

It is not an unprimeable number, because it can be changed into a prime (21154366367) 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 63 ways as a sum of consecutive naturals, for example, 8601604 + ... + 8604062.

It is an arithmetic number, because the mean of its divisors is an integer number (494696160).

Almost surely, 2^21154366347 is an apocalyptic number.

21154366347 is a deficient number, since it is larger than the sum of its proper divisors (10506187893).

21154366347 is a wasteful number, since it uses less digits than its factorization.

21154366347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2660.

The product of its digits is 362880, while the sum is 42.

The spelling of 21154366347 in words is "twenty-one billion, one hundred fifty-four million, three hundred sixty-six thousand, three hundred forty-seven".