30101220 has 120 divisors (see below), whose sum is σ = 100074744. Its totient is φ = 7547904.

The previous prime is 30101189. The next prime is 30101221. The reversal of 30101220 is 2210103.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15539364 + 14561856 = 3942^2 + 3816^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30101221) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 26994 + ... + 28086.

Almost surely, 2^30101220 is an apocalyptic number.

30101220 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 30101220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50037372).

30101220 is an abundant number, since it is smaller than the sum of its proper divisors (69973524).

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

30101220 is a wasteful number, since it uses less digits than its factorization.

30101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131 (or 1120 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 30101220 is about 5486.4578737105. The cubic root of 30101220 is about 311.0723183868.

Adding to 30101220 its reverse (2210103), we get a palindrome (32311323).

The spelling of 30101220 in words is "thirty million, one hundred one thousand, two hundred twenty".