21352103531 has 8 divisors (see below), whose sum is σ = 23315635200. Its totient is φ = 19392310440.

The previous prime is 21352103527. The next prime is 21352103543. The reversal of 21352103531 is 13530125312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21352103531 - 2² = 21352103527 is a prime.

It is a super-2 number, since 2×21352103531² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21352103531.

It is not an unprimeable number, because it can be changed into a prime (21352103551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 922691 + ... + 945548.

It is an arithmetic number, because the mean of its divisors is an integer number (2914454400).

Almost surely, 2^21352103531 is an apocalyptic number.

21352103531 is a deficient number, since it is larger than the sum of its proper divisors (1963531669).

21352103531 is a wasteful number, since it uses less digits than its factorization.

21352103531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1869289.

The product of its (nonzero) digits is 2700, while the sum is 26.

Adding to 21352103531 its reverse (13530125312), we get a palindrome (34882228843).

The spelling of 21352103531 in words is "twenty-one billion, three hundred fifty-two million, one hundred three thousand, five hundred thirty-one".