21464678770 has 8 divisors (see below), whose sum is σ = 38636421804. Its totient is φ = 8585871504.

The previous prime is 21464678759. The next prime is 21464678777. The reversal of 21464678770 is 7787646412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20209181281 + 1255497489 = 142159^2 + 35433^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21464678777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1073233929 + ... + 1073233948.

Almost surely, 2^21464678770 is an apocalyptic number.

21464678770 is a deficient number, since it is larger than the sum of its proper divisors (17171743034).

21464678770 is a wasteful number, since it uses less digits than its factorization.

21464678770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2146467884.

The product of its (nonzero) digits is 3161088, while the sum is 52.

The spelling of 21464678770 in words is "twenty-one billion, four hundred sixty-four million, six hundred seventy-eight thousand, seven hundred seventy".