221543165051025 has 24 divisors (see below), whose sum is σ = 367804553106144. Its totient is φ = 117666079353600.

The previous prime is 221543165051023. The next prime is 221543165051041. The reversal of 221543165051025 is 520150561345122.

It is a happy number.

It is not a de Polignac number, because 221543165051025 - 2¹ = 221543165051023 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221543165051023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6128423559 + ... + 6128459708.

It is an arithmetic number, because the mean of its divisors is an integer number (15325189712756).

Almost surely, 2^{221543165051025} is an apocalyptic number.

221543165051025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221543165051025 is a deficient number, since it is larger than the sum of its proper divisors (146261388055119).

221543165051025 is a wasteful number, since it uses less digits than its factorization.

221543165051025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12256883521 (or 12256883516 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 42.

The spelling of 221543165051025 in words is "two hundred twenty-one trillion, five hundred forty-three billion, one hundred sixty-five million, fifty-one thousand, twenty-five".