221012102001 has 4 divisors (see below), whose sum is σ = 294682802672. Its totient is φ = 147341401332.

The previous prime is 221012101979. The next prime is 221012102023. The reversal of 221012102001 is 100201210122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (221012101979) and next prime (221012102023).

It is not a de Polignac number, because 221012102001 - 2¹⁸ = 221011839857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221012102041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36835350331 + ... + 36835350336.

It is an arithmetic number, because the mean of its divisors is an integer number (73670700668).

Almost surely, 2^221012102001 is an apocalyptic number.

It is an amenable number.

221012102001 is a deficient number, since it is larger than the sum of its proper divisors (73670700671).

221012102001 is an equidigital number, since it uses as much as digits as its factorization.

221012102001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73670700670.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 221012102001 its reverse (100201210122), we get a palindrome (321213312123).

The spelling of 221012102001 in words is "two hundred twenty-one billion, twelve million, one hundred two thousand, one".