221203101021 has 16 divisors (see below), whose sum is σ = 337414324224. Its totient is φ = 126273172464.

The previous prime is 221203101017. The next prime is 221203101127. The reversal of 221203101021 is 120101302122.

It is not a de Polignac number, because 221203101021 - 2² = 221203101017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221203103021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5337181 + ... + 5378466.

It is an arithmetic number, because the mean of its divisors is an integer number (21088395264).

Almost surely, 2^221203101021 is an apocalyptic number.

221203101021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221203101021 is a deficient number, since it is larger than the sum of its proper divisors (116211223203).

221203101021 is a wasteful number, since it uses less digits than its factorization.

221203101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10716640.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 221203101021 its reverse (120101302122), we get a palindrome (341304403143).

The spelling of 221203101021 in words is "two hundred twenty-one billion, two hundred three million, one hundred one thousand, twenty-one".