3101221020 has 96 divisors (see below), whose sum is σ = 8817500160. Its totient is φ = 814302720.

The previous prime is 3101220989. The next prime is 3101221043. The reversal of 3101221020 is 201221013.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 3101220987 and 3101221005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1446069 + ... + 1448211.

It is an arithmetic number, because the mean of its divisors is an integer number (91848960).

Almost surely, 2^3101221020 is an apocalyptic number.

3101221020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3101221020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4408750080).

3101221020 is an abundant number, since it is smaller than the sum of its proper divisors (5716279140).

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

3101221020 is a wasteful number, since it uses less digits than its factorization.

3101221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2515 (or 2513 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 3101221020 is about 55688.6076320822. The cubic root of 3101221020 is about 1458.2911482183.

Adding to 3101221020 its reverse (201221013), we get a palindrome (3302442033).

The spelling of 3101221020 in words is "three billion, one hundred one million, two hundred twenty-one thousand, twenty".