21212025019 has 2 divisors, whose sum is σ = 21212025020. Its totient is φ = 21212025018.

The previous prime is 21212024971. The next prime is 21212025041. The reversal of 21212025019 is 91052021212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21212025019 - 2¹³ = 21212016827 is a prime.

It is a super-2 number, since 2×21212025019² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21212024984 and 21212025002.

It is not a weakly prime, because it can be changed into another prime (21212025059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606012509 + 10606012510.

It is an arithmetic number, because the mean of its divisors is an integer number (10606012510).

Almost surely, 2^21212025019 is an apocalyptic number.

21212025019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212025019 is an equidigital number, since it uses as much as digits as its factorization.

21212025019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

The spelling of 21212025019 in words is "twenty-one billion, two hundred twelve million, twenty-five thousand, nineteen".