102215091 has 32 divisors (see below), whose sum is σ = 157280256. Its totient is φ = 58464000.

The previous prime is 102215063. The next prime is 102215119. The reversal of 102215091 is 190512201.

It is an interprime number because it is at equal distance from previous prime (102215063) and next prime (102215119).

It is not a de Polignac number, because 102215091 - 2¹⁷ = 102084019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (102215021) 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, 40725 + ... + 43161.

It is an arithmetic number, because the mean of its divisors is an integer number (4915008).

Almost surely, 2^102215091 is an apocalyptic number.

102215091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

102215091 is a deficient number, since it is larger than the sum of its proper divisors (55065165).

102215091 is a wasteful number, since it uses less digits than its factorization.

102215091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2523.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 102215091 is about 10110.1479217665. The cubic root of 102215091 is about 467.5610657360.

Adding to 102215091 its reverse (190512201), we get a palindrome (292727292).

The spelling of 102215091 in words is "one hundred two million, two hundred fifteen thousand, ninety-one".