21535003500423 has 64 divisors (see below), whose sum is σ = 33471434637312. Its totient is φ = 12061771948800.

The previous prime is 21535003500407. The next prime is 21535003500449. The reversal of 21535003500423 is 32400530053512.

It is not a de Polignac number, because 21535003500423 - 2⁴ = 21535003500407 is a prime.

It is a super-2 number, since 2×21535003500423² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21535003500223) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1881931140 + ... + 1881942582.

It is an arithmetic number, because the mean of its divisors is an integer number (522991166208).

Almost surely, 2^{21535003500423} is an apocalyptic number.

21535003500423 is a deficient number, since it is larger than the sum of its proper divisors (11936431136889).

21535003500423 is a wasteful number, since it uses less digits than its factorization.

21535003500423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19044.

The product of its (nonzero) digits is 54000, while the sum is 33.

Adding to 21535003500423 its reverse (32400530053512), we get a palindrome (53935533553935).

The spelling of 21535003500423 in words is "twenty-one trillion, five hundred thirty-five billion, three million, five hundred thousand, four hundred twenty-three".