21001002101222 has 32 divisors (see below), whose sum is σ = 37010708935200. Its totient is φ = 8811144990720.

The previous prime is 21001002101153. The next prime is 21001002101251. The reversal of 21001002101222 is 22210120010012.

It is a super-3 number, since 3×21001002101222³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21001002101197 and 21001002101206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3529904 + ... + 7379852.

It is an arithmetic number, because the mean of its divisors is an integer number (1156584654225).

Almost surely, 2^{21001002101222} is an apocalyptic number.

21001002101222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21001002101222 is a deficient number, since it is larger than the sum of its proper divisors (16009706833978).

21001002101222 is a wasteful number, since it uses less digits than its factorization.

21001002101222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3869048.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21001002101222 its reverse (22210120010012), we get a palindrome (43211122111234).

The spelling of 21001002101222 in words is "twenty-one trillion, one billion, two million, one hundred one thousand, two hundred twenty-two".