2021155206 has 16 divisors (see below), whose sum is σ = 4619783424. Its totient is φ = 577472904.

The previous prime is 2021155193. The next prime is 2021155231. The reversal of 2021155206 is 6025511202.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24061330 + ... + 24061413.

It is an arithmetic number, because the mean of its divisors is an integer number (288736464).

Almost surely, 2^2021155206 is an apocalyptic number.

2021155206 is an abundant number, since it is smaller than the sum of its proper divisors (2598628218).

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

2021155206 is a wasteful number, since it uses less digits than its factorization.

2021155206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48122755.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 2021155206 is about 44957.2597696968. The cubic root of 2021155206 is about 1264.3477931716.

Adding to 2021155206 its reverse (6025511202), we get a palindrome (8046666408).

The spelling of 2021155206 in words is "two billion, twenty-one million, one hundred fifty-five thousand, two hundred six".