2120981 has 2 divisors, whose sum is σ = 2120982. Its totient is φ = 2120980.

The previous prime is 2120977. The next prime is 2121011. The reversal of 2120981 is 1890212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1865956 + 255025 = 1366^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120981 - 2² = 2120977 is a prime.

It is a super-2 number, since 2×2120981² = 8997120804722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060490 + 1060491.

It is an arithmetic number, because the mean of its divisors is an integer number (1060491).

2^2120981 is an apocalyptic number.

It is an amenable number.

2120981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120981 is an equidigital number, since it uses as much as digits as its factorization.

2120981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 2120981 is about 1456.3588156770. The cubic root of 2120981 is about 128.4829775530.

The spelling of 2120981 in words is "two million, one hundred twenty thousand, nine hundred eighty-one".