21652613543642 has 32 divisors (see below), whose sum is σ = 34432227694800. Its totient is φ = 10176795353088.

The previous prime is 21652613543621. The next prime is 21652613543647. The reversal of 21652613543642 is 24634531625612.

It can be written as a sum of positive squares in 8 ways, for example, as 8897937009481 + 12754676534161 = 2982941^2 + 3571369^2 .

It is not an unprimeable number, because it can be changed into a prime (21652613543647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108647984 + ... + 108847092.

Almost surely, 2^{21652613543642} is an apocalyptic number.

21652613543642 is a deficient number, since it is larger than the sum of its proper divisors (12779614151158).

21652613543642 is a wasteful number, since it uses less digits than its factorization.

21652613543642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203090.

The product of its digits is 6220800, while the sum is 50.

The spelling of 21652613543642 in words is "twenty-one trillion, six hundred fifty-two billion, six hundred thirteen million, five hundred forty-three thousand, six hundred forty-two".