21021212311453 has 2 divisors, whose sum is σ = 21021212311454. Its totient is φ = 21021212311452.

The previous prime is 21021212311331. The next prime is 21021212311457. The reversal of 21021212311453 is 35411321212012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12910353237604 + 8110859073849 = 3593098^2 + 2847957^2 .

It is a cyclic number.

It is not a de Polignac number, because 21021212311453 - 2²⁵ = 21021178757021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21021212311457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510606155726 + 10510606155727.

It is an arithmetic number, because the mean of its divisors is an integer number (10510606155727).

Almost surely, 2^{21021212311453} is an apocalyptic number.

It is an amenable number.

21021212311453 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021212311453 is an equidigital number, since it uses as much as digits as its factorization.

21021212311453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 28.

Adding to 21021212311453 its reverse (35411321212012), we get a palindrome (56432533523465).

The spelling of 21021212311453 in words is "twenty-one trillion, twenty-one billion, two hundred twelve million, three hundred eleven thousand, four hundred fifty-three".