21053251157 has 2 divisors, whose sum is σ = 21053251158. Its totient is φ = 21053251156.

The previous prime is 21053251147. The next prime is 21053251187. The reversal of 21053251157 is 75115235012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20590528036 + 462723121 = 143494^2 + 21511^2 .

It is a cyclic number.

It is not a de Polignac number, because 21053251157 - 2¹⁰ = 21053250133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21053251117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10526625578 + 10526625579.

It is an arithmetic number, because the mean of its divisors is an integer number (10526625579).

Almost surely, 2^21053251157 is an apocalyptic number.

It is an amenable number.

21053251157 is a deficient number, since it is larger than the sum of its proper divisors (1).

21053251157 is an equidigital number, since it uses as much as digits as its factorization.

21053251157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10500, while the sum is 32.

Adding to 21053251157 its reverse (75115235012), we get a palindrome (96168486169).

The spelling of 21053251157 in words is "twenty-one billion, fifty-three million, two hundred fifty-one thousand, one hundred fifty-seven".