21210023021212 has 48 divisors (see below), whose sum is σ = 37613877683200. Its totient is φ = 10464002781120.

The previous prime is 21210023021197. The next prime is 21210023021227. The reversal of 21210023021212 is 21212032001212.

It is an interprime number because it is at equal distance from previous prime (21210023021197) and next prime (21210023021227).

It is a self number, because there is not a number n which added to its sum of digits gives 21210023021212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159360589 + ... + 159493627.

Almost surely, 2^{21210023021212} is an apocalyptic number.

It is an amenable number.

21210023021212 is a deficient number, since it is larger than the sum of its proper divisors (16403854661988).

21210023021212 is a wasteful number, since it uses less digits than its factorization.

21210023021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134546 (or 134544 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21210023021212 its reverse (21212032001212), we get a palindrome (42422055022424).

The spelling of 21210023021212 in words is "twenty-one trillion, two hundred ten billion, twenty-three million, twenty-one thousand, two hundred twelve".