21115542601652 has 12 divisors (see below), whose sum is σ = 37419948914880. Its totient is φ = 10424128625976.

The previous prime is 21115542601649. The next prime is 21115542601679. The reversal of 21115542601652 is 25610624551112.

It is a super-2 number, since 2×21115542601652² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33410668358 + ... + 33410668989.

It is an arithmetic number, because the mean of its divisors is an integer number (3118329076240).

Almost surely, 2^{21115542601652} is an apocalyptic number.

It is an amenable number.

21115542601652 is a deficient number, since it is larger than the sum of its proper divisors (16304406313228).

21115542601652 is a wasteful number, since it uses less digits than its factorization.

21115542601652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66821337430 (or 66821337428 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 41.

The spelling of 21115542601652 in words is "twenty-one trillion, one hundred fifteen billion, five hundred forty-two million, six hundred one thousand, six hundred fifty-two".