21450420367 has 12 divisors (see below), whose sum is σ = 23250683496. Its totient is φ = 19772210160.

The previous prime is 21450420359. The next prime is 21450420371. The reversal of 21450420367 is 76302405412.

It is not a de Polignac number, because 21450420367 - 2³ = 21450420359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450420347) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 789609 + ... + 816322.

It is an arithmetic number, because the mean of its divisors is an integer number (1937556958).

Almost surely, 2^21450420367 is an apocalyptic number.

21450420367 is a deficient number, since it is larger than the sum of its proper divisors (1800263129).

21450420367 is a wasteful number, since it uses less digits than its factorization.

21450420367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606006 (or 1605987 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 34.

Adding to 21450420367 its reverse (76302405412), we get a palindrome (97752825779).

The spelling of 21450420367 in words is "twenty-one billion, four hundred fifty million, four hundred twenty thousand, three hundred sixty-seven".