21352103451 has 48 divisors (see below), whose sum is σ = 36148851648. Its totient is φ = 11890022400.

The previous prime is 21352103447. The next prime is 21352103453. The reversal of 21352103451 is 15430125312.

It is not a de Polignac number, because 21352103451 - 2² = 21352103447 is a prime.

It is a super-2 number, since 2×21352103451² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21352103453) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2519361 + ... + 2527821.

It is an arithmetic number, because the mean of its divisors is an integer number (753101076).

Almost surely, 2^21352103451 is an apocalyptic number.

21352103451 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21352103451 is a deficient number, since it is larger than the sum of its proper divisors (14796748197).

21352103451 is a wasteful number, since it uses less digits than its factorization.

21352103451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9492 (or 9489 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 21352103451 its reverse (15430125312), we get a palindrome (36782228763).

The spelling of 21352103451 in words is "twenty-one billion, three hundred fifty-two million, one hundred three thousand, four hundred fifty-one".