21798429379 has 2 divisors, whose sum is σ = 21798429380. Its totient is φ = 21798429378.

The previous prime is 21798429337. The next prime is 21798429461. The reversal of 21798429379 is 97392489712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21798429379 - 2³¹ = 19650945731 is a prime.

It is not a weakly prime, because it can be changed into another prime (21798429319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10899214689 + 10899214690.

It is an arithmetic number, because the mean of its divisors is an integer number (10899214690).

Almost surely, 2^21798429379 is an apocalyptic number.

21798429379 is a deficient number, since it is larger than the sum of its proper divisors (1).

21798429379 is an equidigital number, since it uses as much as digits as its factorization.

21798429379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13716864, while the sum is 61.

The spelling of 21798429379 in words is "twenty-one billion, seven hundred ninety-eight million, four hundred twenty-nine thousand, three hundred seventy-nine".