21240929419 has 2 divisors, whose sum is σ = 21240929420. Its totient is φ = 21240929418.

The previous prime is 21240929393. The next prime is 21240929441. The reversal of 21240929419 is 91492904212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21240929419 is a prime.

It is a super-2 number, since 2×21240929419² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21240929119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620464709 + 10620464710.

It is an arithmetic number, because the mean of its divisors is an integer number (10620464710).

Almost surely, 2^21240929419 is an apocalyptic number.

21240929419 is a deficient number, since it is larger than the sum of its proper divisors (1).

21240929419 is an equidigital number, since it uses as much as digits as its factorization.

21240929419 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 43.

The spelling of 21240929419 in words is "twenty-one billion, two hundred forty million, nine hundred twenty-nine thousand, four hundred nineteen".