21061412453 has 8 divisors (see below), whose sum is σ = 21252756888. Its totient is φ = 20870155264.

The previous prime is 21061412347. The next prime is 21061412461. The reversal of 21061412453 is 35421416012.

It can be written as a sum of positive squares in 4 ways, for example, as 13786369 + 21047626084 = 3713^2 + 145078^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21061412453 - 2²⁴ = 21044635237 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 (21061412483) 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, 524975 + ... + 563667.

It is an arithmetic number, because the mean of its divisors is an integer number (2656594611).

Almost surely, 2^21061412453 is an apocalyptic number.

It is an amenable number.

21061412453 is a deficient number, since it is larger than the sum of its proper divisors (191344435).

21061412453 is a wasteful number, since it uses less digits than its factorization.

21061412453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43623.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 21061412453 its reverse (35421416012), we get a palindrome (56482828465).

The spelling of 21061412453 in words is "twenty-one billion, sixty-one million, four hundred twelve thousand, four hundred fifty-three".