21020001193 has 4 divisors (see below), whose sum is σ = 21020322820. Its totient is φ = 21019679568.

The previous prime is 21020001137. The next prime is 21020001199. The reversal of 21020001193 is 39110002012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5388000409 + 15632000784 = 73403^2 + 125028^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020001193 - 2⁹ = 21020000681 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21020001193.

It is not an unprimeable number, because it can be changed into a prime (21020001199) 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, 23958 + ... + 206431.

It is an arithmetic number, because the mean of its divisors is an integer number (5255080705).

Almost surely, 2^21020001193 is an apocalyptic number.

It is an amenable number.

21020001193 is a deficient number, since it is larger than the sum of its proper divisors (321627).

21020001193 is an equidigital number, since it uses as much as digits as its factorization.

21020001193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321626.

The product of its (nonzero) digits is 108, while the sum is 19.

The spelling of 21020001193 in words is "twenty-one billion, twenty million, one thousand, one hundred ninety-three".