215205114021 has 16 divisors (see below), whose sum is σ = 298006488000. Its totient is φ = 138024044928.

The previous prime is 215205113987. The next prime is 215205114023. The reversal of 215205114021 is 120411502512.

It is a happy number.

It is not a de Polignac number, because 215205114021 - 2¹¹ = 215205111973 is a prime.

It is a super-3 number, since 3×215205114021³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 215205113982 and 215205114000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215205114023) 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, 10882171 + ... + 10901928.

It is an arithmetic number, because the mean of its divisors is an integer number (18625405500).

Almost surely, 2^215205114021 is an apocalyptic number.

It is an amenable number.

215205114021 is a deficient number, since it is larger than the sum of its proper divisors (82801373979).

215205114021 is a wasteful number, since it uses less digits than its factorization.

215205114021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21784228.

The product of its (nonzero) digits is 800, while the sum is 24.

Adding to 215205114021 its reverse (120411502512), we get a palindrome (335616616533).

The spelling of 215205114021 in words is "two hundred fifteen billion, two hundred five million, one hundred fourteen thousand, twenty-one".