125663216221 has 8 divisors (see below), whose sum is σ = 126106172640. Its totient is φ = 125220356112.

The previous prime is 125663216117. The next prime is 125663216281. The reversal of 125663216221 is 122612366521.

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 125663216221 - 2¹⁹ = 125662691933 is a prime.

It is a super-2 number, since 2×125663216221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125663216281) 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, 3480166 + ... + 3516088.

It is an arithmetic number, because the mean of its divisors is an integer number (15763271580).

Almost surely, 2^125663216221 is an apocalyptic number.

It is an amenable number.

125663216221 is a deficient number, since it is larger than the sum of its proper divisors (442956419).

125663216221 is a wasteful number, since it uses less digits than its factorization.

125663216221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48155.

The product of its digits is 51840, while the sum is 37.

The spelling of 125663216221 in words is "one hundred twenty-five billion, six hundred sixty-three million, two hundred sixteen thousand, two hundred twenty-one".