61571021121 has 24 divisors (see below), whose sum is σ = 93819073920. Its totient is φ = 38802921696.

The previous prime is 61571021119. The next prime is 61571021147. The reversal of 61571021121 is 12112017516.

61571021121 is a `hidden beast` number, since 61 + 571 + 0 + 2 + 11 + 21 = 666.

It is not a de Polignac number, because 61571021121 - 2¹ = 61571021119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61571021621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 309666 + ... + 468011.

It is an arithmetic number, because the mean of its divisors is an integer number (3909128080).

Almost surely, 2^61571021121 is an apocalyptic number.

It is an amenable number.

61571021121 is a deficient number, since it is larger than the sum of its proper divisors (32248052799).

61571021121 is a wasteful number, since it uses less digits than its factorization.

61571021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778165 (or 778162 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 27.

Adding to 61571021121 its reverse (12112017516), we get a palindrome (73683038637).

The spelling of 61571021121 in words is "sixty-one billion, five hundred seventy-one million, twenty-one thousand, one hundred twenty-one".