21200042443213 has 32 divisors (see below), whose sum is σ = 22770278133120. Its totient is φ = 19666883358720.

The previous prime is 21200042443211. The next prime is 21200042443231. The reversal of 21200042443213 is 31234424000212.

It is a cyclic number.

It is not a de Polignac number, because 21200042443213 - 2¹ = 21200042443211 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 (21200042443211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1171458181 + ... + 1171476277.

It is an arithmetic number, because the mean of its divisors is an integer number (711571191660).

Almost surely, 2^{21200042443213} is an apocalyptic number.

It is an amenable number.

21200042443213 is a deficient number, since it is larger than the sum of its proper divisors (1570235689907).

21200042443213 is a wasteful number, since it uses less digits than its factorization.

21200042443213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20077.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21200042443213 its reverse (31234424000212), we get a palindrome (52434466443425).

The spelling of 21200042443213 in words is "twenty-one trillion, two hundred billion, forty-two million, four hundred forty-three thousand, two hundred thirteen".