21400600243 has 8 divisors (see below), whose sum is σ = 23350473216. Its totient is φ = 19451454600.

The previous prime is 21400600241. The next prime is 21400600253. The reversal of 21400600243 is 34200600412.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21400600243 - 2¹ = 21400600241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21400600241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119371 + ... + 238852.

It is an arithmetic number, because the mean of its divisors is an integer number (2918809152).

Almost surely, 2^21400600243 is an apocalyptic number.

21400600243 is a deficient number, since it is larger than the sum of its proper divisors (1949872973).

21400600243 is a wasteful number, since it uses less digits than its factorization.

21400600243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363665.

The product of its (nonzero) digits is 1152, while the sum is 22.

The spelling of 21400600243 in words is "twenty-one billion, four hundred million, six hundred thousand, two hundred forty-three".