21025401541 has 2 divisors, whose sum is σ = 21025401542. Its totient is φ = 21025401540.

The previous prime is 21025401487. The next prime is 21025401547. The reversal of 21025401541 is 14510452012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13958477316 + 7066924225 = 118146^2 + 84065^2 .

It is a cyclic number.

It is not a de Polignac number, because 21025401541 - 2¹³ = 21025393349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21025401547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10512700770 + 10512700771.

It is an arithmetic number, because the mean of its divisors is an integer number (10512700771).

Almost surely, 2^21025401541 is an apocalyptic number.

It is an amenable number.

21025401541 is a deficient number, since it is larger than the sum of its proper divisors (1).

21025401541 is an equidigital number, since it uses as much as digits as its factorization.

21025401541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 21025401541 its reverse (14510452012), we get a palindrome (35535853553).

The spelling of 21025401541 in words is "twenty-one billion, twenty-five million, four hundred one thousand, five hundred forty-one".