102121236 has 84 divisors (see below), whose sum is σ = 306284832. Its totient is φ = 29171664.

The previous prime is 102121231. The next prime is 102121237. The reversal of 102121236 is 632121201.

It is a tau number, because it is divible by the number of its divisors (84).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102121231) 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 27 ways as a sum of consecutive naturals, for example, 17911 + ... + 22913.

It is an arithmetic number, because the mean of its divisors is an integer number (3646248).

Almost surely, 2^102121236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 102121236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153142416).

102121236 is an abundant number, since it is smaller than the sum of its proper divisors (204163596).

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

102121236 is an equidigital number, since it uses as much as digits as its factorization.

102121236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5032 (or 5015 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 102121236 is about 10105.5052322979. The cubic root of 102121236 is about 467.4179153737.

Adding to 102121236 its reverse (632121201), we get a palindrome (734242437).

The spelling of 102121236 in words is "one hundred two million, one hundred twenty-one thousand, two hundred thirty-six".