221620100061 has 8 divisors (see below), whose sum is σ = 295504231104. Its totient is φ = 147741351200.

The previous prime is 221620100057. The next prime is 221620100087. The reversal of 221620100061 is 160001026122.

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

It is a cyclic number.

It is not a de Polignac number, because 221620100061 - 2² = 221620100057 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221620100011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1248465 + ... + 1414886.

It is an arithmetic number, because the mean of its divisors is an integer number (36938028888).

Almost surely, 2^221620100061 is an apocalyptic number.

It is an amenable number.

221620100061 is a deficient number, since it is larger than the sum of its proper divisors (73884131043).

221620100061 is a wasteful number, since it uses less digits than its factorization.

221620100061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2691091.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 221620100061 its reverse (160001026122), we get a palindrome (381621126183).

The spelling of 221620100061 in words is "two hundred twenty-one billion, six hundred twenty million, one hundred thousand, sixty-one".