2021012200 has 24 divisors (see below), whose sum is σ = 4698853830. Its totient is φ = 808404800.

The previous prime is 2021012183. The next prime is 2021012243. The reversal of 2021012200 is 22101202.

It can be written as a sum of positive squares in 3 ways, for example, as 1924225956 + 96786244 = 43866^2 + 9838^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5052331 + ... + 5052730.

Almost surely, 2^2021012200 is an apocalyptic number.

2021012200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021012200 is an abundant number, since it is smaller than the sum of its proper divisors (2677841630).

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

2021012200 is a wasteful number, since it uses less digits than its factorization.

2021012200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10105077 (or 10105068 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2021012200 is about 44955.6692754095. The cubic root of 2021012200 is about 1264.3179730000.

Adding to 2021012200 its reverse (22101202), we get a palindrome (2043113402).

The spelling of 2021012200 in words is "two billion, twenty-one million, twelve thousand, two hundred".