21002132212 has 6 divisors (see below), whose sum is σ = 36753731378. Its totient is φ = 10501066104.

The previous prime is 21002132167. The next prime is 21002132233. The reversal of 21002132212 is 21223120012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17920105956 + 3082026256 = 133866^2 + 55516^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625266523 + ... + 2625266530.

Almost surely, 2^21002132212 is an apocalyptic number.

It is an amenable number.

21002132212 is a deficient number, since it is larger than the sum of its proper divisors (15751599166).

21002132212 is a wasteful number, since it uses less digits than its factorization.

21002132212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5250533057 (or 5250533055 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21002132212 its reverse (21223120012), we get a palindrome (42225252224).

It can be divided in two parts, 2100 and 2132212, that added together give a palindrome (2134312).

The spelling of 21002132212 in words is "twenty-one billion, two million, one hundred thirty-two thousand, two hundred twelve".