2151124021 has 2 divisors, whose sum is σ = 2151124022. Its totient is φ = 2151124020.

The previous prime is 2151124009. The next prime is 2151124049. The reversal of 2151124021 is 1204211512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1331447121 + 819676900 = 36489^2 + 28630^2 .

It is a cyclic number.

It is not a de Polignac number, because 2151124021 - 2¹⁹ = 2150599733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2151124021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2151134021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075562010 + 1075562011.

It is an arithmetic number, because the mean of its divisors is an integer number (1075562011).

Almost surely, 2^2151124021 is an apocalyptic number.

It is an amenable number.

2151124021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151124021 is an equidigital number, since it uses as much as digits as its factorization.

2151124021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 2151124021 is about 46380.2115238816. The cubic root of 2151124021 is about 1290.8877612075.

Adding to 2151124021 its reverse (1204211512), we get a palindrome (3355335533).

The spelling of 2151124021 in words is "two billion, one hundred fifty-one million, one hundred twenty-four thousand, twenty-one".