1371721020 has 24 divisors (see below), whose sum is σ = 3840819024. Its totient is φ = 365792256.

The previous prime is 1371721009. The next prime is 1371721049. The reversal of 1371721020 is 201271731.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11430949 + ... + 11431068.

It is an arithmetic number, because the mean of its divisors is an integer number (160034126).

Almost surely, 2^1371721020 is an apocalyptic number.

1371721020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1371721020 is an abundant number, since it is smaller than the sum of its proper divisors (2469098004).

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

1371721020 is a wasteful number, since it uses less digits than its factorization.

1371721020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22862029 (or 22862027 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 24.

The square root of 1371721020 is about 37036.7522874239. The cubic root of 1371721020 is about 1111.1054161116.

Adding to 1371721020 its reverse (201271731), we get a palindrome (1572992751).

The spelling of 1371721020 in words is "one billion, three hundred seventy-one million, seven hundred twenty-one thousand, twenty".