21820115395 has 16 divisors (see below), whose sum is σ = 28222481952. Its totient is φ = 16099499520.

The previous prime is 21820115389. The next prime is 21820115459. The reversal of 21820115395 is 59351102812.

It is not a de Polignac number, because 21820115395 - 2¹⁹ = 21819591107 is a prime.

It is a super-2 number, since 2×21820115395² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67222 + ... + 219451.

It is an arithmetic number, because the mean of its divisors is an integer number (1763905122).

Almost surely, 2^21820115395 is an apocalyptic number.

21820115395 is a deficient number, since it is larger than the sum of its proper divisors (6402366557).

21820115395 is a wasteful number, since it uses less digits than its factorization.

21820115395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287862.

The product of its (nonzero) digits is 21600, while the sum is 37.

The spelling of 21820115395 in words is "twenty-one billion, eight hundred twenty million, one hundred fifteen thousand, three hundred ninety-five".