221012212012001 has 4 divisors (see below), whose sum is σ = 221012523761604. Its totient is φ = 221011900262400.

The previous prime is 221012212011989. The next prime is 221012212012003. The reversal of 221012212012001 is 100210212210122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54374474949025 + 166637737062976 = 7373905^2 + 12908824^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221012212012001 is a prime.

It is a super-2 number, since 2×221012212012001² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221012212012003) 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, 154808960 + ... + 156230081.

It is an arithmetic number, because the mean of its divisors is an integer number (55253130940401).

Almost surely, 2^{221012212012001} is an apocalyptic number.

It is an amenable number.

221012212012001 is a deficient number, since it is larger than the sum of its proper divisors (311749603).

221012212012001 is an equidigital number, since it uses as much as digits as its factorization.

221012212012001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311749602.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221012212012001 its reverse (100210212210122), we get a palindrome (321222424222123).

The spelling of 221012212012001 in words is "two hundred twenty-one trillion, twelve billion, two hundred twelve million, twelve thousand, one".