215313021235 has 32 divisors (see below), whose sum is σ = 278924385600. Its totient is φ = 158615912448.

The previous prime is 215313021233. The next prime is 215313021239. The reversal of 215313021235 is 532120313512.

It is a cyclic number.

It is not a de Polignac number, because 215313021235 - 2¹ = 215313021233 is a prime.

It is a super-2 number, since 2×215313021235² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215313021233) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74321307 + ... + 74324203.

It is an arithmetic number, because the mean of its divisors is an integer number (8716387050).

Almost surely, 2^215313021235 is an apocalyptic number.

215313021235 is a deficient number, since it is larger than the sum of its proper divisors (63611364365).

215313021235 is a wasteful number, since it uses less digits than its factorization.

215313021235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5287.

The product of its (nonzero) digits is 5400, while the sum is 28.

Adding to 215313021235 its reverse (532120313512), we get a palindrome (747433334747).

The spelling of 215313021235 in words is "two hundred fifteen billion, three hundred thirteen million, twenty-one thousand, two hundred thirty-five".