101215550 has 48 divisors (see below), whose sum is σ = 194451840. Its totient is φ = 39174240.

The previous prime is 101215549. The next prime is 101215559. The reversal of 101215550 is 55512101.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101215559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 384719 + ... + 384981.

It is an arithmetic number, because the mean of its divisors is an integer number (4051080).

Almost surely, 2^101215550 is an apocalyptic number.

101215550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

101215550 is a deficient number, since it is larger than the sum of its proper divisors (93236290).

101215550 is a wasteful number, since it uses less digits than its factorization.

101215550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497 (or 492 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 101215550 is about 10060.5939188499. The cubic root of 101215550 is about 466.0320085831.

Adding to 101215550 its reverse (55512101), we get a palindrome (156727651).

The spelling of 101215550 in words is "one hundred one million, two hundred fifteen thousand, five hundred fifty".