102021210 has 48 divisors (see below), whose sum is σ = 272433096. Its totient is φ = 26469504.

The previous prime is 102021197. The next prime is 102021251. The reversal of 102021210 is 12120201.

It can be written as a sum of positive squares in 4 ways, for example, as 101787921 + 233289 = 10089^2 + 483^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 102021192 and 102021201.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11989 + ... + 18648.

Almost surely, 2^102021210 is an apocalyptic number.

102021210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

102021210 is an abundant number, since it is smaller than the sum of its proper divisors (170411886).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

102021210 is a wasteful number, since it uses less digits than its factorization.

102021210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30687 (or 30684 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 102021210 is about 10100.5549352498. The cubic root of 102021210 is about 467.2652562421.

Adding to 102021210 its reverse (12120201), we get a palindrome (114141411).

The spelling of 102021210 in words is "one hundred two million, twenty-one thousand, two hundred ten".