213121213321963 has 2 divisors, whose sum is σ = 213121213321964. Its totient is φ = 213121213321962.

The previous prime is 213121213321937. The next prime is 213121213321993. The reversal of 213121213321963 is 369123312121312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213121213321963 is a prime.

It is not a weakly prime, because it can be changed into another prime (213121213321993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106560606660981 + 106560606660982.

It is an arithmetic number, because the mean of its divisors is an integer number (106560606660982).

Almost surely, 2^{213121213321963} is an apocalyptic number.

213121213321963 is a deficient number, since it is larger than the sum of its proper divisors (1).

213121213321963 is an equidigital number, since it uses as much as digits as its factorization.

213121213321963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 40.

The spelling of 213121213321963 in words is "two hundred thirteen trillion, one hundred twenty-one billion, two hundred thirteen million, three hundred twenty-one thousand, nine hundred sixty-three".