213122020 has 12 divisors (see below), whose sum is σ = 447556284. Its totient is φ = 85248800.

The previous prime is 213121991. The next prime is 213122029. The reversal of 213122020 is 20221312.

It can be written as a sum of positive squares in 2 ways, for example, as 132158016 + 80964004 = 11496^2 + 8998^2 .

It is not an unprimeable number, because it can be changed into a prime (213122029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5328031 + ... + 5328070.

It is an arithmetic number, because the mean of its divisors is an integer number (37296357).

Almost surely, 2^213122020 is an apocalyptic number.

213122020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213122020 is an abundant number, since it is smaller than the sum of its proper divisors (234434264).

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

213122020 is a wasteful number, since it uses less digits than its factorization.

213122020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10656110 (or 10656108 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 213122020 is about 14598.6992571256. The cubic root of 213122020 is about 597.3232800788.

Adding to 213122020 its reverse (20221312), we get a palindrome (233343332).

It can be divided in two parts, 21312 and 2020, that added together give a palindrome (23332).

The spelling of 213122020 in words is "two hundred thirteen million, one hundred twenty-two thousand, twenty".