211221011002 has 16 divisors (see below), whose sum is σ = 327905045640. Its totient is φ = 101922624832.

The previous prime is 211221010999. The next prime is 211221011017. The reversal of 211221011002 is 200110122112.

It can be written as a sum of positive squares in 4 ways, for example, as 196505137521 + 14715873481 = 443289^2 + 121309^2 .

It is a super-2 number, since 2×211221011002² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 694453 + ... + 951160.

Almost surely, 2^211221011002 is an apocalyptic number.

211221011002 is a deficient number, since it is larger than the sum of its proper divisors (116684034638).

211221011002 is a wasteful number, since it uses less digits than its factorization.

211221011002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647857.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 211221011002 its reverse (200110122112), we get a palindrome (411331133114).

It can be divided in two parts, 2112210 and 11002, that added together give a palindrome (2123212).

The spelling of 211221011002 in words is "two hundred eleven billion, two hundred twenty-one million, eleven thousand, two".