21749149625147 has 8 divisors (see below), whose sum is σ = 25434221488896. Its totient is φ = 18208590383592.

The previous prime is 21749149625111. The next prime is 21749149625171. The reversal of 21749149625147 is 74152694194712.

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

It is a de Polignac number, because none of the positive numbers 2^k-21749149625147 is a prime.

It is a super-2 number, since 2×21749149625147² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21749149625147.

It is not an unprimeable number, because it can be changed into a prime (21749149625197) 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, 36128155223 + ... + 36128155824.

It is an arithmetic number, because the mean of its divisors is an integer number (3179277686112).

Almost surely, 2^{21749149625147} is an apocalyptic number.

21749149625147 is a deficient number, since it is larger than the sum of its proper divisors (3685071863749).

21749149625147 is an equidigital number, since it uses as much as digits as its factorization.

21749149625147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72256311097.

The product of its digits is 30481920, while the sum is 62.

The spelling of 21749149625147 in words is "twenty-one trillion, seven hundred forty-nine billion, one hundred forty-nine million, six hundred twenty-five thousand, one hundred forty-seven".