61220205217101 has 8 divisors (see below), whose sum is σ = 93287931759424. Its totient is φ = 34982974409760.

The previous prime is 61220205217097. The next prime is 61220205217109. The reversal of 61220205217101 is 10171250202216.

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 61220205217101 - 2² = 61220205217097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61220205217109) 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, 1457623933720 + ... + 1457623933761.

It is an arithmetic number, because the mean of its divisors is an integer number (11660991469928).

Almost surely, 2^{61220205217101} is an apocalyptic number.

It is an amenable number.

61220205217101 is a deficient number, since it is larger than the sum of its proper divisors (32067726542323).

61220205217101 is a wasteful number, since it uses less digits than its factorization.

61220205217101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2915247867491.

The product of its (nonzero) digits is 3360, while the sum is 30.

Adding to 61220205217101 its reverse (10171250202216), we get a palindrome (71391455419317).

The spelling of 61220205217101 in words is "sixty-one trillion, two hundred twenty billion, two hundred five million, two hundred seventeen thousand, one hundred one".