21212001002212 has 24 divisors (see below), whose sum is σ = 40046186138616. Its totient is φ = 9793776265728.

The previous prime is 21212001002183. The next prime is 21212001002221. The reversal of 21212001002212 is 21220010021212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15872463168676 + 5339537833536 = 3984026^2 + 2310744^2 .

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, 2942837823 + ... + 2942845030.

It is an arithmetic number, because the mean of its divisors is an integer number (1668591089109).

Almost surely, 2^{21212001002212} is an apocalyptic number.

It is an amenable number.

21212001002212 is a deficient number, since it is larger than the sum of its proper divisors (18834185136404).

21212001002212 is a wasteful number, since it uses less digits than its factorization.

21212001002212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5885682927 (or 5885682925 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21212001002212 its reverse (21220010021212), we get a palindrome (42432011023424).

The spelling of 21212001002212 in words is "twenty-one trillion, two hundred twelve billion, one million, two thousand, two hundred twelve".