21021020002195 has 16 divisors (see below), whose sum is σ = 25939492625088. Its totient is φ = 16341777475200.

The previous prime is 21021020002193. The next prime is 21021020002231. The reversal of 21021020002195 is 59120002012012.

It is not a de Polignac number, because 21021020002195 - 2¹ = 21021020002193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021020002193) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71136831 + ... + 71431720.

It is an arithmetic number, because the mean of its divisors is an integer number (1621218289068).

Almost surely, 2^{21021020002195} is an apocalyptic number.

21021020002195 is a deficient number, since it is larger than the sum of its proper divisors (4918472622893).

21021020002195 is a wasteful number, since it uses less digits than its factorization.

21021020002195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142569390.

The product of its (nonzero) digits is 720, while the sum is 25.

The spelling of 21021020002195 in words is "twenty-one trillion, twenty-one billion, twenty million, two thousand, one hundred ninety-five".