71470140921 has 9 divisors (see below), whose sum is σ = 103235806479. Its totient is φ = 47646225936.

The previous prime is 71470140919. The next prime is 71470140953. The reversal of 71470140921 is 12904107417.

The square root of 71470140921 is 267339.

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., 31175199225 + 40294941696 = 176565^2 + 200736^2 .

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

It is not a de Polignac number, because 71470140921 - 2¹ = 71470140919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71470140901) 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, 757461 + ... + 846573.

Almost surely, 2^71470140921 is an apocalyptic number.

71470140921 is the 267339-th square number.

71470140921 is the 133670-th centered octagonal number.

It is an amenable number.

71470140921 is a deficient number, since it is larger than the sum of its proper divisors (31765665558).

71470140921 is an frugal number, since it uses more digits than its factorization.

71470140921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178232 (or 89116 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

Multiplying 71470140921 by its sum of digits (36), we get a square (2572925073156 = 1604034²).

The spelling of 71470140921 in words is "seventy-one billion, four hundred seventy million, one hundred forty thousand, nine hundred twenty-one".