70221735185281 has 9 divisors (see below), whose sum is σ = 70780088692161. Its totient is φ = 69667752276612.

The previous prime is 70221735185243. The next prime is 70221735185299. The reversal of 70221735185281 is 18258153712207.

The square root of 70221735185281 is 8379841.

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

It is not a de Polignac number, because 70221735185281 - 2¹¹ = 70221735183233 is a prime.

It is a super-2 number, since 2×70221735185281² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70221735185881) 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, 1064206816 + ... + 1064272798.

It is an arithmetic number, because the mean of its divisors is an integer number (7864454299129).

Almost surely, 2^{70221735185281} is an apocalyptic number.

70221735185281 is the 8379841-st square number.

70221735185281 is the 4189921-st centered octagonal number.

It is an amenable number.

70221735185281 is a deficient number, since it is larger than the sum of its proper divisors (558353506880).

70221735185281 is an frugal number, since it uses more digits than its factorization.

70221735185281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132220 (or 66110 counting only the distinct ones).

The product of its (nonzero) digits is 1881600, while the sum is 52.

Adding to 70221735185281 its reverse (18258153712207), we get a palindrome (88479888897488).

The spelling of 70221735185281 in words is "seventy trillion, two hundred twenty-one billion, seven hundred thirty-five million, one hundred eighty-five thousand, two hundred eighty-one".