21050310220157 has 2 divisors, whose sum is σ = 21050310220158. Its totient is φ = 21050310220156.

The previous prime is 21050310220117. The next prime is 21050310220183. The reversal of 21050310220157 is 75102201305012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10722127585156 + 10328182635001 = 3274466^2 + 3213749^2 .

It is a cyclic number.

It is not a de Polignac number, because 21050310220157 - 2¹⁴ = 21050310203773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21050310220117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10525155110078 + 10525155110079.

It is an arithmetic number, because the mean of its divisors is an integer number (10525155110079).

Almost surely, 2^{21050310220157} is an apocalyptic number.

It is an amenable number.

21050310220157 is a deficient number, since it is larger than the sum of its proper divisors (1).

21050310220157 is an equidigital number, since it uses as much as digits as its factorization.

21050310220157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 29.

Adding to 21050310220157 its reverse (75102201305012), we get a palindrome (96152511525169).

The spelling of 21050310220157 in words is "twenty-one trillion, fifty billion, three hundred ten million, two hundred twenty thousand, one hundred fifty-seven".