3950213521 has 2 divisors, whose sum is σ = 3950213522. Its totient is φ = 3950213520.

The previous prime is 3950213513. The next prime is 3950213567. The reversal of 3950213521 is 1253120593.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3948865600 + 1347921 = 62840^2 + 1161^2 .

It is a cyclic number.

It is not a de Polignac number, because 3950213521 - 2³ = 3950213513 is a prime.

It is a super-2 number, since 2×3950213521² = 31208373722982434882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3950513521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1975106760 + 1975106761.

It is an arithmetic number, because the mean of its divisors is an integer number (1975106761).

Almost surely, 2^3950213521 is an apocalyptic number.

It is an amenable number.

3950213521 is a deficient number, since it is larger than the sum of its proper divisors (1).

3950213521 is an equidigital number, since it uses as much as digits as its factorization.

3950213521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 3950213521 is about 62850.7241087961. The cubic root of 3950213521 is about 1580.7876115123.

The spelling of 3950213521 in words is "three billion, nine hundred fifty million, two hundred thirteen thousand, five hundred twenty-one".