4938951221 has 2 divisors, whose sum is σ = 4938951222. Its totient is φ = 4938951220.

The previous prime is 4938951209. The next prime is 4938951239. The reversal of 4938951221 is 1221598394.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4721064100 + 217887121 = 68710^2 + 14761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4938951221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4938950221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2469475610 + 2469475611.

It is an arithmetic number, because the mean of its divisors is an integer number (2469475611).

Almost surely, 2^4938951221 is an apocalyptic number.

It is an amenable number.

4938951221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4938951221 is an equidigital number, since it uses as much as digits as its factorization.

4938951221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 44.

The square root of 4938951221 is about 70277.6722793235. The cubic root of 4938951221 is about 1702.9879656098.

The spelling of 4938951221 in words is "four billion, nine hundred thirty-eight million, nine hundred fifty-one thousand, two hundred twenty-one".