1021566651201 has 48 divisors (see below), whose sum is σ = 1573712262720. Its totient is φ = 636354109440.

The previous prime is 1021566651197. The next prime is 1021566651229.

1021566651201 is nontrivially palindromic in base 10.

1021566651201 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1021566651201 - 2² = 1021566651197 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1021566651251) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14463510 + ... + 14533968.

It is an arithmetic number, because the mean of its divisors is an integer number (32785672140).

Almost surely, 2^{1021566651201} is an apocalyptic number.

It is an amenable number.

1021566651201 is a deficient number, since it is larger than the sum of its proper divisors (552145611519).

1021566651201 is a wasteful number, since it uses less digits than its factorization.

1021566651201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71166 (or 71163 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The spelling of 1021566651201 in words is "one trillion, twenty-one billion, five hundred sixty-six million, six hundred fifty-one thousand, two hundred one".