20211201523 has 2 divisors, whose sum is σ = 20211201524. Its totient is φ = 20211201522.

The previous prime is 20211201497. The next prime is 20211201547. The reversal of 20211201523 is 32510211202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20211201523 - 2²¹ = 20209104371 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20211201523.

It is not a weakly prime, because it can be changed into another prime (20211205523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105600761 + 10105600762.

It is an arithmetic number, because the mean of its divisors is an integer number (10105600762).

Almost surely, 2^20211201523 is an apocalyptic number.

20211201523 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211201523 is an equidigital number, since it uses as much as digits as its factorization.

20211201523 is an odious number, because the sum of its binary digits is odd.

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

Adding to 20211201523 its reverse (32510211202), we get a palindrome (52721412725).

The spelling of 20211201523 in words is "twenty billion, two hundred eleven million, two hundred one thousand, five hundred twenty-three".