21121400343 has 8 divisors (see below), whose sum is σ = 28180054000. Its totient is φ = 14071840128.

The previous prime is 21121400329. The next prime is 21121400401. The reversal of 21121400343 is 34300412112.

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

It is not a de Polignac number, because 21121400343 - 2¹⁷ = 21121269271 is a prime.

It is a super-2 number, since 2×21121400343² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121400303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2267938 + ... + 2277231.

It is an arithmetic number, because the mean of its divisors is an integer number (3522506750).

Almost surely, 2^21121400343 is an apocalyptic number.

21121400343 is a deficient number, since it is larger than the sum of its proper divisors (7058653657).

21121400343 is a wasteful number, since it uses less digits than its factorization.

21121400343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4546721.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21121400343 its reverse (34300412112), we get a palindrome (55421812455).

The spelling of 21121400343 in words is "twenty-one billion, one hundred twenty-one million, four hundred thousand, three hundred forty-three".