211221210001004 has 18 divisors (see below), whose sum is σ = 429986034645300. Its totient is φ = 90523375714632.

The previous prime is 211221210001003. The next prime is 211221210001033. The reversal of 211221210001004 is 400100012122112.

It is a super-2 number, since 2×211221210001004² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211221210001003) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 538829617154 + ... + 538829617545.

It is an arithmetic number, because the mean of its divisors is an integer number (23888113035850).

Almost surely, 2^{211221210001004} is an apocalyptic number.

It is an amenable number.

211221210001004 is an abundant number, since it is smaller than the sum of its proper divisors (218764824644296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211221210001004 is a wasteful number, since it uses less digits than its factorization.

211221210001004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077659234717 (or 1077659234708 counting only the distinct ones).

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

Adding to 211221210001004 its reverse (400100012122112), we get a palindrome (611321222123116).

The spelling of 211221210001004 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred ten million, one thousand, four".