1021171012072 has 8 divisors (see below), whose sum is σ = 1914695647650. Its totient is φ = 510585506032.

The previous prime is 1021171012061. The next prime is 1021171012129. The reversal of 1021171012072 is 2702101711201.

It can be written as a sum of positive squares in only one way, i.e., 885206249316 + 135964762756 = 940854^2 + 368734^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63823188247 + ... + 63823188262.

Almost surely, 2^{1021171012072} is an apocalyptic number.

It is an amenable number.

1021171012072 is a deficient number, since it is larger than the sum of its proper divisors (893524635578).

1021171012072 is a wasteful number, since it uses less digits than its factorization.

1021171012072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127646376515 (or 127646376511 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 25.

Adding to 1021171012072 its reverse (2702101711201), we get a palindrome (3723272723273).

The spelling of 1021171012072 in words is "one trillion, twenty-one billion, one hundred seventy-one million, twelve thousand, seventy-two".