102021432320 has 44 divisors (see below), whose sum is σ = 244731893484. Its totient is φ = 40808570880.

The previous prime is 102021432319. The next prime is 102021432323. The reversal of 102021432320 is 23234120201.

It can be written as a sum of positive squares in 2 ways, for example, as 43851710464 + 58169721856 = 209408^2 + 241184^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 102021432292 and 102021432301.

It is not an unprimeable number, because it can be changed into a prime (102021432323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9957911 + ... + 9968150.

Almost surely, 2^102021432320 is an apocalyptic number.

102021432320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102021432320 is an abundant number, since it is smaller than the sum of its proper divisors (142710461164).

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

102021432320 is an equidigital number, since it uses as much as digits as its factorization.

102021432320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19926086 (or 19926068 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 102021432320 its reverse (23234120201), we get a palindrome (125255552521).

The spelling of 102021432320 in words is "one hundred two billion, twenty-one million, four hundred thirty-two thousand, three hundred twenty".