21323210221212 has 48 divisors (see below), whose sum is σ = 50248300862592. Its totient is φ = 7037221907520.

The previous prime is 21323210221151. The next prime is 21323210221273. The reversal of 21323210221212 is 21212201232312.

It is an interprime number because it is at equal distance from previous prime (21323210221151) and next prime (21323210221273).

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, 2606839 + ... + 7031502.

It is an arithmetic number, because the mean of its divisors is an integer number (1046839601304).

Almost surely, 2^{21323210221212} is an apocalyptic number.

It is an amenable number.

21323210221212 is an abundant number, since it is smaller than the sum of its proper divisors (28925090641380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21323210221212 is a wasteful number, since it uses less digits than its factorization.

21323210221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9640178 (or 9640176 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21323210221212 its reverse (21212201232312), we get a palindrome (42535411453524).

The spelling of 21323210221212 in words is "twenty-one trillion, three hundred twenty-three billion, two hundred ten million, two hundred twenty-one thousand, two hundred twelve".