21004252025523 has 32 divisors (see below), whose sum is σ = 30729809436480. Its totient is φ = 12681481512960.

The previous prime is 21004252025513. The next prime is 21004252025567. The reversal of 21004252025523 is 32552025240012.

It is not a de Polignac number, because 21004252025523 - 2⁹ = 21004252025011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21004252025513) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95884143 + ... + 96102951.

It is an arithmetic number, because the mean of its divisors is an integer number (960306544890).

Almost surely, 2^{21004252025523} is an apocalyptic number.

21004252025523 is a deficient number, since it is larger than the sum of its proper divisors (9725557410957).

21004252025523 is a wasteful number, since it uses less digits than its factorization.

21004252025523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265319.

The product of its (nonzero) digits is 48000, while the sum is 33.

Adding to 21004252025523 its reverse (32552025240012), we get a palindrome (53556277265535).

The spelling of 21004252025523 in words is "twenty-one trillion, four billion, two hundred fifty-two million, twenty-five thousand, five hundred twenty-three".