213121450651 has 2 divisors, whose sum is σ = 213121450652. Its totient is φ = 213121450650.

The previous prime is 213121450639. The next prime is 213121450669. The reversal of 213121450651 is 156054121312.

213121450651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213121450651 - 2⁷ = 213121450523 is a prime.

It is a super-3 number, since 3×213121450651³ (a number of 35 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (213121457651) by changing a digit.

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, 106560725325 + 106560725326.

It is an arithmetic number, because the mean of its divisors is an integer number (106560725326).

Almost surely, 2^213121450651 is an apocalyptic number.

213121450651 is a deficient number, since it is larger than the sum of its proper divisors (1).

213121450651 is an equidigital number, since it uses as much as digits as its factorization.

213121450651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 31.

Adding to 213121450651 its reverse (156054121312), we get a palindrome (369175571963).

The spelling of 213121450651 in words is "two hundred thirteen billion, one hundred twenty-one million, four hundred fifty thousand, six hundred fifty-one".