21453020530061 has 2 divisors, whose sum is σ = 21453020530062. Its totient is φ = 21453020530060.

The previous prime is 21453020529949. The next prime is 21453020530079. The reversal of 21453020530061 is 16003502035412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10792834710025 + 10660185820036 = 3285245^2 + 3264994^2 .

It is a cyclic number.

It is not a de Polignac number, because 21453020530061 - 2²² = 21453016335757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21453020830061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10726510265030 + 10726510265031.

It is an arithmetic number, because the mean of its divisors is an integer number (10726510265031).

Almost surely, 2^{21453020530061} is an apocalyptic number.

It is an amenable number.

21453020530061 is a deficient number, since it is larger than the sum of its proper divisors (1).

21453020530061 is an equidigital number, since it uses as much as digits as its factorization.

21453020530061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 32.

Adding to 21453020530061 its reverse (16003502035412), we get a palindrome (37456522565473).

The spelling of 21453020530061 in words is "twenty-one trillion, four hundred fifty-three billion, twenty million, five hundred thirty thousand, sixty-one".