21321231202312 has 8 divisors (see below), whose sum is σ = 39977308504350. Its totient is φ = 10660615601152.

The previous prime is 21321231202303. The next prime is 21321231202321. The reversal of 21321231202312 is 21320213212312.

It is an interprime number because it is at equal distance from previous prime (21321231202303) and next prime (21321231202321).

It can be written as a sum of positive squares in only one way, i.e., 12613621052356 + 8707610149956 = 3551566^2 + 2950866^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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, 1332576950137 + ... + 1332576950152.

Almost surely, 2^{21321231202312} is an apocalyptic number.

It is an amenable number.

21321231202312 is a deficient number, since it is larger than the sum of its proper divisors (18656077302038).

21321231202312 is a wasteful number, since it uses less digits than its factorization.

21321231202312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2665153900295 (or 2665153900291 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21321231202312 its reverse (21320213212312), we get a palindrome (42641444414624).

The spelling of 21321231202312 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred thirty-one million, two hundred two thousand, three hundred twelve".