23121210212 has 6 divisors (see below), whose sum is σ = 40462117878. Its totient is φ = 11560605104.

The previous prime is 23121210193. The next prime is 23121210223. The reversal of 23121210212 is 21201212132.

It can be written as a sum of positive squares in only one way, i.e., 20659462756 + 2461747456 = 143734^2 + 49616^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2890151273 + ... + 2890151280.

It is an arithmetic number, because the mean of its divisors is an integer number (6743686313).

Almost surely, 2^23121210212 is an apocalyptic number.

It is an amenable number.

23121210212 is a deficient number, since it is larger than the sum of its proper divisors (17340907666).

23121210212 is a wasteful number, since it uses less digits than its factorization.

23121210212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5780302557 (or 5780302555 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 23121210212 its reverse (21201212132), we get a palindrome (44322422344).

The spelling of 23121210212 in words is "twenty-three billion, one hundred twenty-one million, two hundred ten thousand, two hundred twelve".