21735015248 has 10 divisors (see below), whose sum is σ = 42111592074. Its totient is φ = 10867507616.

The previous prime is 21735015241. The next prime is 21735015259. The reversal of 21735015248 is 84251053712.

It can be written as a sum of positive squares in only one way, i.e., 21735015184 + 64 = 147428^2 + 8^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21735015241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 679219211 + ... + 679219242.

Almost surely, 2^21735015248 is an apocalyptic number.

It is an amenable number.

21735015248 is a deficient number, since it is larger than the sum of its proper divisors (20376576826).

21735015248 is a wasteful number, since it uses less digits than its factorization.

21735015248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1358438461 (or 1358438455 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 38.

The spelling of 21735015248 in words is "twenty-one billion, seven hundred thirty-five million, fifteen thousand, two hundred forty-eight".