1550105021 has 2 divisors, whose sum is σ = 1550105022. Its totient is φ = 1550105020.

The previous prime is 1550104981. The next prime is 1550105069. The reversal of 1550105021 is 1205010551.

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., 1537502521 + 12602500 = 39211^2 + 3550^2 .

It is an emirp because it is prime and its reverse (1205010551) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1550105021 is a prime.

It is a super-2 number, since 2×1550105021² = 4805651152258820882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1550104984 and 1550105002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1550125021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775052510 + 775052511.

It is an arithmetic number, because the mean of its divisors is an integer number (775052511).

Almost surely, 2^1550105021 is an apocalyptic number.

It is an amenable number.

1550105021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1550105021 is an equidigital number, since it uses as much as digits as its factorization.

1550105021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 1550105021 is about 39371.3731155011. The cubic root of 1550105021 is about 1157.3206643562.

Adding to 1550105021 its reverse (1205010551), we get a palindrome (2755115572).

The spelling of 1550105021 in words is "one billion, five hundred fifty million, one hundred five thousand, twenty-one".