21421480429 has 2 divisors, whose sum is σ = 21421480430. Its totient is φ = 21421480428.

The previous prime is 21421480393. The next prime is 21421480477. The reversal of 21421480429 is 92408412412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14725822500 + 6695657929 = 121350^2 + 81827^2 .

It is a cyclic number.

It is not a de Polignac number, because 21421480429 - 2¹⁷ = 21421349357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21421490429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10710740214 + 10710740215.

It is an arithmetic number, because the mean of its divisors is an integer number (10710740215).

Almost surely, 2^21421480429 is an apocalyptic number.

It is an amenable number.

21421480429 is a deficient number, since it is larger than the sum of its proper divisors (1).

21421480429 is an equidigital number, since it uses as much as digits as its factorization.

21421480429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36864, while the sum is 37.

The spelling of 21421480429 in words is "twenty-one billion, four hundred twenty-one million, four hundred eighty thousand, four hundred twenty-nine".