10505554021 has 2 divisors, whose sum is σ = 10505554022. Its totient is φ = 10505554020.

The previous prime is 10505554001. The next prime is 10505554061. The reversal of 10505554021 is 12045550501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8702277796 + 1803276225 = 93286^2 + 42465^2 .

It is a cyclic number.

It is not a de Polignac number, because 10505554021 - 2²¹ = 10503456869 is a prime.

It is a super-2 number, since 2×10505554021² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10505554001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252777010 + 5252777011.

It is an arithmetic number, because the mean of its divisors is an integer number (5252777011).

Almost surely, 2^10505554021 is an apocalyptic number.

It is an amenable number.

10505554021 is a deficient number, since it is larger than the sum of its proper divisors (1).

10505554021 is an equidigital number, since it uses as much as digits as its factorization.

10505554021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5000, while the sum is 28.

The spelling of 10505554021 in words is "ten billion, five hundred five million, five hundred fifty-four thousand, twenty-one".