21016126453 has 16 divisors (see below), whose sum is σ = 24806145024. Its totient is φ = 17423642880.

The previous prime is 21016126403. The next prime is 21016126463. The reversal of 21016126453 is 35462161012.

It is a happy number.

It is not a de Polignac number, because 21016126453 - 2³³ = 12426191861 is a prime.

It is a super-2 number, since 2×21016126453² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21016126403) 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, 409101 + ... + 457597.

It is an arithmetic number, because the mean of its divisors is an integer number (1550384064).

Almost surely, 2^21016126453 is an apocalyptic number.

It is an amenable number.

21016126453 is a deficient number, since it is larger than the sum of its proper divisors (3790018571).

21016126453 is a wasteful number, since it uses less digits than its factorization.

21016126453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50532.

The product of its (nonzero) digits is 8640, while the sum is 31.

Adding to 21016126453 its reverse (35462161012), we get a palindrome (56478287465).

The spelling of 21016126453 in words is "twenty-one billion, sixteen million, one hundred twenty-six thousand, four hundred fifty-three".