2011251220 has 48 divisors (see below), whose sum is σ = 4611112128. Its totient is φ = 730805760.

The previous prime is 2011251199. The next prime is 2011251227. The reversal of 2011251220 is 221521102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2011251194 and 2011251203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011251227) 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, 381724 + ... + 386956.

It is an arithmetic number, because the mean of its divisors is an integer number (96064836).

Almost surely, 2^2011251220 is an apocalyptic number.

2011251220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2011251220 is an abundant number, since it is smaller than the sum of its proper divisors (2599860908).

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

2011251220 is a wasteful number, since it uses less digits than its factorization.

2011251220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7000 (or 6998 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 2011251220 is about 44846.9755947935. The cubic root of 2011251220 is about 1262.2792414714.

Adding to 2011251220 its reverse (221521102), we get a palindrome (2232772322).

The spelling of 2011251220 in words is "two billion, eleven million, two hundred fifty-one thousand, two hundred twenty".