61220335212 has 18 divisors (see below), whose sum is σ = 154751402988. Its totient is φ = 20406778392.

The previous prime is 61220335199. The next prime is 61220335229. The reversal of 61220335212 is 21253302216.

It is a happy number.

61220335212 is a `hidden beast` number, since 612 + 2 + 0 + 3 + 35 + 2 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 850282398 + ... + 850282469.

It is an arithmetic number, because the mean of its divisors is an integer number (8597300166).

Almost surely, 2^61220335212 is an apocalyptic number.

It is an amenable number.

61220335212 is an abundant number, since it is smaller than the sum of its proper divisors (93531067776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61220335212 is a wasteful number, since it uses less digits than its factorization.

61220335212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700564877 (or 1700564872 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 61220335212 its reverse (21253302216), we get a palindrome (82473637428).

The spelling of 61220335212 in words is "sixty-one billion, two hundred twenty million, three hundred thirty-five thousand, two hundred twelve".