221012212122221 has 8 divisors (see below), whose sum is σ = 245690995113984. Its totient is φ = 197430263930160.

The previous prime is 221012212122101. The next prime is 221012212122223. The reversal of 221012212122221 is 122221212210122.

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 221012212122221 - 2⁴² = 216614165611117 is a prime.

It is a super-2 number, since 2×221012212122221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012212122223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274208699501 + ... + 274208700306.

It is an arithmetic number, because the mean of its divisors is an integer number (30711374389248).

Almost surely, 2^{221012212122221} is an apocalyptic number.

It is an amenable number.

221012212122221 is a deficient number, since it is larger than the sum of its proper divisors (24678782991763).

221012212122221 is a wasteful number, since it uses less digits than its factorization.

221012212122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548417399851.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 221012212122221 its reverse (122221212210122), we get a palindrome (343233424332343).

The spelling of 221012212122221 in words is "two hundred twenty-one trillion, twelve billion, two hundred twelve million, one hundred twenty-two thousand, two hundred twenty-one".