2021010121 has 8 divisors (see below), whose sum is σ = 2180031560. Its totient is φ = 1862497152.

The previous prime is 2021010113. The next prime is 2021010127. The reversal of 2021010121 is 1210101202.

It can be written as a sum of positive squares in 4 ways, for example, as 101606400 + 1919403721 = 10080^2 + 43811^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2021010121 - 2³ = 2021010113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021010098 and 2021010107.

It is not an unprimeable number, because it can be changed into a prime (2021010127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118836 + ... + 134773.

It is an arithmetic number, because the mean of its divisors is an integer number (272503945).

Almost surely, 2^2021010121 is an apocalyptic number.

It is an amenable number.

2021010121 is a deficient number, since it is larger than the sum of its proper divisors (159021439).

2021010121 is a wasteful number, since it uses less digits than its factorization.

2021010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254235.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 2021010121 is about 44955.6461526247. The cubic root of 2021010121 is about 1264.3175394684.

Adding to 2021010121 its reverse (1210101202), we get a palindrome (3231111323).

The spelling of 2021010121 in words is "two billion, twenty-one million, ten thousand, one hundred twenty-one".