2921220 has 36 divisors (see below), whose sum is σ = 8861580. Its totient is φ = 778944.

The previous prime is 2921213. The next prime is 2921221. The reversal of 2921220 is 221292.

It can be written as a sum of positive squares in 2 ways, for example, as 2143296 + 777924 = 1464^2 + 882^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2921193 and 2921202.

It is not an unprimeable number, because it can be changed into a prime (2921221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7935 + ... + 8294.

It is an arithmetic number, because the mean of its divisors is an integer number (246155).

2^2921220 is an apocalyptic number.

2921220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2921220 is an abundant number, since it is smaller than the sum of its proper divisors (5940360).

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

2921220 is a wasteful number, since it uses less digits than its factorization.

2921220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16244 (or 16239 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 2921220 is about 1709.1576872834. The cubic root of 2921220 is about 142.9512931745.

The spelling of 2921220 in words is "two million, nine hundred twenty-one thousand, two hundred twenty".