9070101978921 has 27 divisors (see below), whose sum is σ = 13604827663063. Its totient is φ = 6046572022920.

The previous prime is 9070101978911. The next prime is 9070101978947. The reversal of 9070101978921 is 1298791010709.

The square root of 9070101978921 is 3011661.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2789364279321 + 6280737699600 = 1670139^2 + 2506140^2 .

It is a tau number, because it is divible by the number of its divisors (27).

It is not a de Polignac number, because 9070101978921 - 2¹⁹ = 9070101454633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9070101978911) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 243925951 + ... + 243963131.

Almost surely, 2^{9070101978921} is an apocalyptic number.

9070101978921 is the 3011661-st square number.

9070101978921 is the 1505831-st centered octagonal number.

It is an amenable number.

9070101978921 is a deficient number, since it is larger than the sum of its proper divisors (4534725684142).

9070101978921 is an frugal number, since it uses more digits than its factorization.

9070101978921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74386 (or 37184 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 54.

The spelling of 9070101978921 in words is "nine trillion, seventy billion, one hundred one million, nine hundred seventy-eight thousand, nine hundred twenty-one".