21001002111212 has 24 divisors (see below), whose sum is σ = 36770984544000. Its totient is φ = 10495007254656.

The previous prime is 21001002111203. The next prime is 21001002111251. The reversal of 21001002111212 is 21211120010012.

It is a super-2 number, since 2×21001002111212² (a number of 27 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, 126850664 + ... + 127016112.

It is an arithmetic number, because the mean of its divisors is an integer number (1532124356000).

Almost surely, 2^{21001002111212} is an apocalyptic number.

It is an amenable number.

21001002111212 is a deficient number, since it is larger than the sum of its proper divisors (15769982432788).

21001002111212 is a wasteful number, since it uses less digits than its factorization.

21001002111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181865 (or 181863 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21001002111212 its reverse (21211120010012), we get a palindrome (42212122121224).

The spelling of 21001002111212 in words is "twenty-one trillion, one billion, two million, one hundred eleven thousand, two hundred twelve".