21450461053 has 16 divisors (see below), whose sum is σ = 24625782144. Its totient is φ = 18302976000.

The previous prime is 21450461047. The next prime is 21450461069. The reversal of 21450461053 is 35016405412.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21450461053 - 2²¹ = 21448363901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450461003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4046901 + ... + 4052197.

It is an arithmetic number, because the mean of its divisors is an integer number (1539111384).

Almost surely, 2^21450461053 is an apocalyptic number.

It is an amenable number.

21450461053 is a deficient number, since it is larger than the sum of its proper divisors (3175321091).

21450461053 is a wasteful number, since it uses less digits than its factorization.

21450461053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7812.

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 21450461053 its reverse (35016405412), we get a palindrome (56466866465).

The spelling of 21450461053 in words is "twenty-one billion, four hundred fifty million, four hundred sixty-one thousand, fifty-three".