221210012021 has 8 divisors (see below), whose sum is σ = 229030765920. Its totient is φ = 213402113008.

The previous prime is 221210011991. The next prime is 221210012069. The reversal of 221210012021 is 120210012122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221210012021 - 2¹⁰ = 221210010997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221210011987 and 221210012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221210012081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3178691 + ... + 3247536.

It is an arithmetic number, because the mean of its divisors is an integer number (28628845740).

Almost surely, 2^221210012021 is an apocalyptic number.

It is an amenable number.

221210012021 is a deficient number, since it is larger than the sum of its proper divisors (7820753899).

221210012021 is a wasteful number, since it uses less digits than its factorization.

221210012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6427443.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221210012021 its reverse (120210012122), we get a palindrome (341420024143).

The spelling of 221210012021 in words is "two hundred twenty-one billion, two hundred ten million, twelve thousand, twenty-one".