21213600656043 has 4 divisors (see below), whose sum is σ = 28284800874728. Its totient is φ = 14142400437360.

The previous prime is 21213600655979. The next prime is 21213600656081. The reversal of 21213600656043 is 34065600631212.

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

It is not a de Polignac number, because 21213600656043 - 2⁶ = 21213600655979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21213600655992 and 21213600656010.

It is not an unprimeable number, because it can be changed into a prime (21213600651043) 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, 3535600109338 + ... + 3535600109343.

It is an arithmetic number, because the mean of its divisors is an integer number (7071200218682).

Almost surely, 2^{21213600656043} is an apocalyptic number.

21213600656043 is a deficient number, since it is larger than the sum of its proper divisors (7071200218685).

21213600656043 is an equidigital number, since it uses as much as digits as its factorization.

21213600656043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7071200218684.

The product of its (nonzero) digits is 155520, while the sum is 39.

The spelling of 21213600656043 in words is "twenty-one trillion, two hundred thirteen billion, six hundred million, six hundred fifty-six thousand, forty-three".