221021029975 has 12 divisors (see below), whose sum is σ = 275273423784. Its totient is φ = 176037890720.

The previous prime is 221021029973. The next prime is 221021029997. The reversal of 221021029975 is 579920120122.

It is not a de Polignac number, because 221021029975 - 2¹ = 221021029973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021029973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19467544 + ... + 19478893.

It is an arithmetic number, because the mean of its divisors is an integer number (22939451982).

Almost surely, 2^221021029975 is an apocalyptic number.

221021029975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

221021029975 is a deficient number, since it is larger than the sum of its proper divisors (54252393809).

221021029975 is a wasteful number, since it uses less digits than its factorization.

221021029975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38946674 (or 38946669 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 40.

The spelling of 221021029975 in words is "two hundred twenty-one billion, twenty-one million, twenty-nine thousand, nine hundred seventy-five".