213121231003 has 2 divisors, whose sum is σ = 213121231004. Its totient is φ = 213121231002.

The previous prime is 213121230947. The next prime is 213121231033. The reversal of 213121231003 is 300132121312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213121231003 is a prime.

It is not a weakly prime, because it can be changed into another prime (213121231033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106560615501 + 106560615502.

It is an arithmetic number, because the mean of its divisors is an integer number (106560615502).

Almost surely, 2^213121231003 is an apocalyptic number.

213121231003 is a deficient number, since it is larger than the sum of its proper divisors (1).

213121231003 is an equidigital number, since it uses as much as digits as its factorization.

213121231003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 213121231003 its reverse (300132121312), we get a palindrome (513253352315).

The spelling of 213121231003 in words is "two hundred thirteen billion, one hundred twenty-one million, two hundred thirty-one thousand, three".