2121564353 has 2 divisors, whose sum is σ = 2121564354. Its totient is φ = 2121564352.

The previous prime is 2121564343. The next prime is 2121564373. The reversal of 2121564353 is 3534651212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1683625024 + 437939329 = 41032^2 + 20927^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121564353 - 2¹² = 2121560257 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121564343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060782176 + 1060782177.

It is an arithmetic number, because the mean of its divisors is an integer number (1060782177).

Almost surely, 2^2121564353 is an apocalyptic number.

It is an amenable number.

2121564353 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121564353 is an equidigital number, since it uses as much as digits as its factorization.

2121564353 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 32.

The square root of 2121564353 is about 46060.4423882359. The cubic root of 2121564353 is about 1284.9475576008.

The spelling of 2121564353 in words is "two billion, one hundred twenty-one million, five hundred sixty-four thousand, three hundred fifty-three".