21661353004652 has 48 divisors (see below), whose sum is σ = 39638472636672. Its totient is φ = 10338060532800.

The previous prime is 21661353004619. The next prime is 21661353004667. The reversal of 21661353004652 is 25640035316612.

It is a super-2 number, since 2×21661353004652² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193741838 + ... + 193853610.

It is an arithmetic number, because the mean of its divisors is an integer number (825801513264).

Almost surely, 2^{21661353004652} is an apocalyptic number.

It is an amenable number.

21661353004652 is a deficient number, since it is larger than the sum of its proper divisors (17977119632020).

21661353004652 is a wasteful number, since it uses less digits than its factorization.

21661353004652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116198 (or 116196 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 44.

The spelling of 21661353004652 in words is "twenty-one trillion, six hundred sixty-one billion, three hundred fifty-three million, four thousand, six hundred fifty-two".