102021550 has 12 divisors (see below), whose sum is σ = 189760176. Its totient is φ = 40808600.

The previous prime is 102021541. The next prime is 102021551. The reversal of 102021550 is 55120201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102021551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1020166 + ... + 1020265.

It is an arithmetic number, because the mean of its divisors is an integer number (15813348).

Almost surely, 2^102021550 is an apocalyptic number.

102021550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

102021550 is a deficient number, since it is larger than the sum of its proper divisors (87738626).

102021550 is a wasteful number, since it uses less digits than its factorization.

102021550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2040443 (or 2040438 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 102021550 is about 10100.5717659942. The cubic root of 102021550 is about 467.2657753172.

Adding to 102021550 its reverse (55120201), we get a palindrome (157141751).

The spelling of 102021550 in words is "one hundred two million, twenty-one thousand, five hundred fifty".