21343453100 has 36 divisors (see below), whose sum is σ = 46326462000. Its totient is φ = 8535322560.

The previous prime is 21343453091. The next prime is 21343453121. The reversal of 21343453100 is 135434312.

It is a super-2 number, since 2×21343453100² (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 21343453100.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 431441 + ... + 478359.

Almost surely, 2^21343453100 is an apocalyptic number.

21343453100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21343453100 is an abundant number, since it is smaller than the sum of its proper divisors (24983008900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21343453100 is a wasteful number, since it uses less digits than its factorization.

21343453100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51482 (or 51475 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 21343453100 its reverse (135434312), we get a palindrome (21478887412).

The spelling of 21343453100 in words is "twenty-one billion, three hundred forty-three million, four hundred fifty-three thousand, one hundred".