2271570921 has 9 divisors (see below), whose sum is σ = 3281364541. Its totient is φ = 1514285292.

The previous prime is 2271570913. The next prime is 2271570967. The reversal of 2271570921 is 1290751722.

The square root of 2271570921 is 47661.

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

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 2271570921 - 2³ = 2271570913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2271570121) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 135040 + ... + 150926.

Almost surely, 2^2271570921 is an apocalyptic number.

2271570921 is the 47661-st square number.

2271570921 is the 23831-st centered octagonal number.

It is an amenable number.

2271570921 is a deficient number, since it is larger than the sum of its proper divisors (1009793620).

2271570921 is an frugal number, since it uses more digits than its factorization.

2271570921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31780 (or 15890 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The cubic root of 2271570921 is about 1314.5449269892.

Multiplying 2271570921 by its sum of digits (36), we get a square (81776553156 = 285966²).

It can be divided in two parts, 22715 and 70921, that added together give a square (93636 = 306²).

The spelling of 2271570921 in words is "two billion, two hundred seventy-one million, five hundred seventy thousand, nine hundred twenty-one".