61242210121 has 4 divisors (see below), whose sum is σ = 63354010500. Its totient is φ = 59130409744.

The previous prime is 61242210103. The next prime is 61242210157. The reversal of 61242210121 is 12101224216.

61242210121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11419059600 + 49823150521 = 106860^2 + 223211^2 .

It is a cyclic number.

It is not a de Polignac number, because 61242210121 - 2⁷ = 61242209993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61242210092 and 61242210101.

It is not an unprimeable number, because it can be changed into a prime (61242210181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1055900146 + ... + 1055900203.

It is an arithmetic number, because the mean of its divisors is an integer number (15838502625).

Almost surely, 2^61242210121 is an apocalyptic number.

It is an amenable number.

61242210121 is a deficient number, since it is larger than the sum of its proper divisors (2111800379).

61242210121 is a wasteful number, since it uses less digits than its factorization.

61242210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2111800378.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 61242210121 its reverse (12101224216), we get a palindrome (73343434337).

The spelling of 61242210121 in words is "sixty-one billion, two hundred forty-two million, two hundred ten thousand, one hundred twenty-one".