61211121 has 8 divisors (see below), whose sum is σ = 82953024. Its totient is φ = 40138320.

The previous prime is 61211113. The next prime is 61211167. The reversal of 61211121 is 12111216.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61211121 - 2³ = 61211113 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61211121.

It is not an unprimeable number, because it can be changed into a prime (61211221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167061 + ... + 167426.

It is an arithmetic number, because the mean of its divisors is an integer number (10369128).

Almost surely, 2^61211121 is an apocalyptic number.

61211121 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

61211121 is a deficient number, since it is larger than the sum of its proper divisors (21741903).

61211121 is a wasteful number, since it uses less digits than its factorization.

61211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334551.

The product of its digits is 24, while the sum is 15.

The square root of 61211121 is about 7823.7536387593. The cubic root of 61211121 is about 394.1033359468.

Adding to 61211121 its reverse (12111216), we get a palindrome (73322337).

The spelling of 61211121 in words is "sixty-one million, two hundred eleven thousand, one hundred twenty-one".