21270517429 has 8 divisors (see below), whose sum is σ = 24311756288. Its totient is φ = 18229926960.

The previous prime is 21270517399. The next prime is 21270517441. The reversal of 21270517429 is 92471507212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21270517429 - 2¹³ = 21270509237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21270517391 and 21270517400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21270518429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89637 + ... + 224890.

It is an arithmetic number, because the mean of its divisors is an integer number (3038969536).

Almost surely, 2^21270517429 is an apocalyptic number.

It is an amenable number.

21270517429 is a deficient number, since it is larger than the sum of its proper divisors (3041238859).

21270517429 is an equidigital number, since it uses as much as digits as its factorization.

21270517429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324195.

The product of its (nonzero) digits is 70560, while the sum is 40.

The spelling of 21270517429 in words is "twenty-one billion, two hundred seventy million, five hundred seventeen thousand, four hundred twenty-nine".