71225121 has 16 divisors (see below), whose sum is σ = 109695168. Its totient is φ = 40627200.

The previous prime is 71225113. The next prime is 71225137. The reversal of 71225121 is 12152217.

It is not a de Polignac number, because 71225121 - 2³ = 71225113 is a prime.

It is a super-2 number, since 2×71225121² = 10146035722929282, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71225101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62920 + ... + 64041.

It is an arithmetic number, because the mean of its divisors is an integer number (6855948).

Almost surely, 2^71225121 is an apocalyptic number.

It is an amenable number.

71225121 is a deficient number, since it is larger than the sum of its proper divisors (38470047).

71225121 is a wasteful number, since it uses less digits than its factorization.

71225121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126992.

The product of its digits is 280, while the sum is 21.

The square root of 71225121 is about 8439.4976746250. The cubic root of 71225121 is about 414.5189587603.

Adding to 71225121 its reverse (12152217), we get a palindrome (83377338).

The spelling of 71225121 in words is "seventy-one million, two hundred twenty-five thousand, one hundred twenty-one".