21111212001122 has 16 divisors (see below), whose sum is σ = 33614029383480. Its totient is φ = 9909663591168.

The previous prime is 21111212001049. The next prime is 21111212001127. The reversal of 21111212001122 is 22110021211112.

It can be written as a sum of positive squares in 4 ways, for example, as 20247039108241 + 864172892881 = 4499671^2 + 929609^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 21111212001122.

It is not an unprimeable number, because it can be changed into a prime (21111212001127) 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, 781999097 + ... + 782026092.

Almost surely, 2^{21111212001122} is an apocalyptic number.

21111212001122 is a deficient number, since it is larger than the sum of its proper divisors (12502817382358).

21111212001122 is a wasteful number, since it uses less digits than its factorization.

21111212001122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1564025605.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21111212001122 its reverse (22110021211112), we get a palindrome (43221233212234).

The spelling of 21111212001122 in words is "twenty-one trillion, one hundred eleven billion, two hundred twelve million, one thousand, one hundred twenty-two".