21021120195703 has 4 divisors (see below), whose sum is σ = 21150084123448. Its totient is φ = 20892156267960.

The previous prime is 21021120195599. The next prime is 21021120195737. The reversal of 21021120195703 is 30759102112012.

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

It is a cyclic number.

It is not a de Polignac number, because 21021120195703 - 2⁴¹ = 18822096940151 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 (21021120195403) 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, 64481963628 + ... + 64481963953.

It is an arithmetic number, because the mean of its divisors is an integer number (5287521030862).

Almost surely, 2^{21021120195703} is an apocalyptic number.

21021120195703 is a deficient number, since it is larger than the sum of its proper divisors (128963927745).

21021120195703 is a wasteful number, since it uses less digits than its factorization.

21021120195703 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128963927744.

The product of its (nonzero) digits is 7560, while the sum is 34.

The spelling of 21021120195703 in words is "twenty-one trillion, twenty-one billion, one hundred twenty million, one hundred ninety-five thousand, seven hundred three".