21100400354 has 24 divisors (see below), whose sum is σ = 34806635724. Its totient is φ = 9586368000.

The previous prime is 21100400341. The next prime is 21100400369. The reversal of 21100400354 is 45300400112.

It can be written as a sum of positive squares in 2 ways, for example, as 21099015025 + 1385329 = 145255^2 + 1177^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 496754 + ... + 537554.

Almost surely, 2^21100400354 is an apocalyptic number.

21100400354 is a deficient number, since it is larger than the sum of its proper divisors (13706235370).

21100400354 is a wasteful number, since it uses less digits than its factorization.

21100400354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42962 (or 42951 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 21100400354 its reverse (45300400112), we get a palindrome (66400800466).

The spelling of 21100400354 in words is "twenty-one billion, one hundred million, four hundred thousand, three hundred fifty-four".