20121453340 has 48 divisors (see below), whose sum is σ = 45913835520. Its totient is φ = 7379000640.

The previous prime is 20121453307. The next prime is 20121453343. The reversal of 20121453340 is 4335412102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121453343) 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, 842272 + ... + 865831.

It is an arithmetic number, because the mean of its divisors is an integer number (956538240).

Almost surely, 2^20121453340 is an apocalyptic number.

20121453340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121453340 is an abundant number, since it is smaller than the sum of its proper divisors (25792382180).

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

20121453340 is a wasteful number, since it uses less digits than its factorization.

20121453340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1708162 (or 1708160 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 20121453340 its reverse (4335412102), we get a palindrome (24456865442).

The spelling of 20121453340 in words is "twenty billion, one hundred twenty-one million, four hundred fifty-three thousand, three hundred forty".