21770649473 has 8 divisors (see below), whose sum is σ = 22151118696. Its totient is φ = 21390940800.

The previous prime is 21770649457. The next prime is 21770649493. The reversal of 21770649473 is 37494607712.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 237169 + 21770412304 = 487^2 + 147548^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21770649473 - 2⁴ = 21770649457 is a prime.

It is a super-2 number, since 2×21770649473² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21770649413) 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, 132236 + ... + 247037.

It is an arithmetic number, because the mean of its divisors is an integer number (2768889837).

Almost surely, 2^21770649473 is an apocalyptic number.

It is an amenable number.

21770649473 is a deficient number, since it is larger than the sum of its proper divisors (380469223).

21770649473 is an equidigital number, since it uses as much as digits as its factorization.

21770649473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380275.

The product of its (nonzero) digits is 1778112, while the sum is 50.

The spelling of 21770649473 in words is "twenty-one billion, seven hundred seventy million, six hundred forty-nine thousand, four hundred seventy-three".