71042121 has 24 divisors (see below), whose sum is σ = 109156320. Its totient is φ = 44395776.

The previous prime is 71042119. The next prime is 71042123. The reversal of 71042121 is 12124017.

It is an interprime number because it is at equal distance from previous prime (71042119) and next prime (71042123).

It is not a de Polignac number, because 71042121 - 2¹ = 71042119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71042094 and 71042103.

It is not an unprimeable number, because it can be changed into a prime (71042123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14446 + ... + 18728.

It is an arithmetic number, because the mean of its divisors is an integer number (4548180).

Almost surely, 2^71042121 is an apocalyptic number.

It is an amenable number.

71042121 is a deficient number, since it is larger than the sum of its proper divisors (38114199).

71042121 is a wasteful number, since it uses less digits than its factorization.

71042121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4405 (or 4402 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 71042121 is about 8428.6488240999. The cubic root of 71042121 is about 414.1636439117.

Adding to 71042121 its reverse (12124017), we get a palindrome (83166138).

The spelling of 71042121 in words is "seventy-one million, forty-two thousand, one hundred twenty-one".