1000021221523 has 2 divisors, whose sum is σ = 1000021221524. Its totient is φ = 1000021221522.

The previous prime is 1000021221439. The next prime is 1000021221533. The reversal of 1000021221523 is 3251221200001.

1000021221523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (3251221200001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1000021221523 - 2¹⁷ = 1000021090451 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1000021221523.

It is not a weakly prime, because it can be changed into another prime (1000021221533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500010610761 + 500010610762.

It is an arithmetic number, because the mean of its divisors is an integer number (500010610762).

Almost surely, 2^{1000021221523} is an apocalyptic number.

1000021221523 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000021221523 is an equidigital number, since it uses as much as digits as its factorization.

1000021221523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 1000021221523 its reverse (3251221200001), we get a palindrome (4251242421524).

The spelling of 1000021221523 in words is "one trillion, twenty-one million, two hundred twenty-one thousand, five hundred twenty-three".