102121530 has 32 divisors (see below), whose sum is σ = 280105344. Its totient is φ = 23342016.

The previous prime is 102121519. The next prime is 102121531. The reversal of 102121530 is 35121201.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (102121531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 242937 + ... + 243356.

It is an arithmetic number, because the mean of its divisors is an integer number (8753292).

Almost surely, 2^102121530 is an apocalyptic number.

102121530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

102121530 is an abundant number, since it is smaller than the sum of its proper divisors (177983814).

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

102121530 is a wasteful number, since it uses less digits than its factorization.

102121530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486310.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 102121530 is about 10105.5197788140. The cubic root of 102121530 is about 467.4183639279.

Adding to 102121530 its reverse (35121201), we get a palindrome (137242731).

The spelling of 102121530 in words is "one hundred two million, one hundred twenty-one thousand, five hundred thirty".