21121404419 has 2 divisors, whose sum is σ = 21121404420. Its totient is φ = 21121404418.

The previous prime is 21121404373. The next prime is 21121404431. The reversal of 21121404419 is 91440412112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21121404419 is a prime.

It is a super-2 number, since 2×21121404419² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121404391 and 21121404400.

It is not a weakly prime, because it can be changed into another prime (21121404319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560702209 + 10560702210.

It is an arithmetic number, because the mean of its divisors is an integer number (10560702210).

Almost surely, 2^21121404419 is an apocalyptic number.

21121404419 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121404419 is an equidigital number, since it uses as much as digits as its factorization.

21121404419 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The spelling of 21121404419 in words is "twenty-one billion, one hundred twenty-one million, four hundred four thousand, four hundred nineteen".