221012000021 has 8 divisors (see below), whose sum is σ = 228688466400. Its totient is φ = 213339224560.

The previous prime is 221012000017. The next prime is 221012000057. The reversal of 221012000021 is 120000210122.

It is a happy number.

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 221012000021 - 2² = 221012000017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221011999966 and 221012000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012000221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 800615 + ... + 1040676.

It is an arithmetic number, because the mean of its divisors is an integer number (28586058300).

Almost surely, 2^221012000021 is an apocalyptic number.

It is an amenable number.

221012000021 is a deficient number, since it is larger than the sum of its proper divisors (7676466379).

221012000021 is a wasteful number, since it uses less digits than its factorization.

221012000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1845459.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 221012000021 its reverse (120000210122), we get a palindrome (341012210143).

The spelling of 221012000021 in words is "two hundred twenty-one billion, twelve million, twenty-one", and thus it is an aban number.