20102121320 has 16 divisors (see below), whose sum is σ = 45229773060. Its totient is φ = 8040848512.

The previous prime is 20102121301. The next prime is 20102121329. The reversal of 20102121320 is 2312120102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19232697124 + 869424196 = 138682^2 + 29486^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20102121295 and 20102121304.

It is not an unprimeable number, because it can be changed into a prime (20102121329) 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, 251276477 + ... + 251276556.

Almost surely, 2^20102121320 is an apocalyptic number.

20102121320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20102121320 is an abundant number, since it is smaller than the sum of its proper divisors (25127651740).

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

20102121320 is a wasteful number, since it uses less digits than its factorization.

20102121320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502553044 (or 502553040 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20102121320 its reverse (2312120102), we get a palindrome (22414241422).

The spelling of 20102121320 in words is "twenty billion, one hundred two million, one hundred twenty-one thousand, three hundred twenty".