21400354111 has 4 divisors (see below), whose sum is σ = 21528500112. Its totient is φ = 21272208112.

The previous prime is 21400354099. The next prime is 21400354123. The reversal of 21400354111 is 11145300412.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21400354099) and next prime (21400354123).

It is a cyclic number.

It is not a de Polignac number, because 21400354111 - 2¹⁵ = 21400321343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400354211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64072750 + ... + 64073083.

It is an arithmetic number, because the mean of its divisors is an integer number (5382125028).

Almost surely, 2^21400354111 is an apocalyptic number.

21400354111 is a deficient number, since it is larger than the sum of its proper divisors (128146001).

21400354111 is a wasteful number, since it uses less digits than its factorization.

21400354111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128146000.

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 21400354111 its reverse (11145300412), we get a palindrome (32545654523).

The spelling of 21400354111 in words is "twenty-one billion, four hundred million, three hundred fifty-four thousand, one hundred eleven".