2867820121 has 4 divisors (see below), whose sum is σ = 2966710500. Its totient is φ = 2768929744.

The previous prime is 2867820101. The next prime is 2867820127. The reversal of 2867820121 is 1210287682.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1843500096 + 1024320025 = 42936^2 + 32005^2 .

It is not a de Polignac number, because 2867820121 - 2⁷ = 2867819993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2867820127) 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, 49445146 + ... + 49445203.

It is an arithmetic number, because the mean of its divisors is an integer number (741677625).

Almost surely, 2^2867820121 is an apocalyptic number.

It is an amenable number.

2867820121 is a deficient number, since it is larger than the sum of its proper divisors (98890379).

2867820121 is an equidigital number, since it uses as much as digits as its factorization.

2867820121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98890378.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 2867820121 is about 53552.0319035609. The cubic root of 2867820121 is about 1420.7488150327.

The spelling of 2867820121 in words is "two billion, eight hundred sixty-seven million, eight hundred twenty thousand, one hundred twenty-one".