4951109021 has 2 divisors, whose sum is σ = 4951109022. Its totient is φ = 4951109020.

The previous prime is 4951109011. The next prime is 4951109041. The reversal of 4951109021 is 1209011594.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4534540921 + 416568100 = 67339^2 + 20410^2 .

It is a cyclic number.

It is not a de Polignac number, because 4951109021 - 2²² = 4946914717 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4951109011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2475554510 + 2475554511.

It is an arithmetic number, because the mean of its divisors is an integer number (2475554511).

Almost surely, 2^4951109021 is an apocalyptic number.

It is an amenable number.

4951109021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4951109021 is an equidigital number, since it uses as much as digits as its factorization.

4951109021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 4951109021 is about 70364.1174250058. The cubic root of 4951109021 is about 1704.3841879011.

The spelling of 4951109021 in words is "four billion, nine hundred fifty-one million, one hundred nine thousand, twenty-one".