21352625389 has 2 divisors, whose sum is σ = 21352625390. Its totient is φ = 21352625388.

The previous prime is 21352625293. The next prime is 21352625407. The reversal of 21352625389 is 98352625312.

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., 21335568489 + 17056900 = 146067^2 + 4130^2 .

It is a cyclic number.

It is not a de Polignac number, because 21352625389 - 2⁹ = 21352624877 is a prime.

It is a super-2 number, since 2×21352625389² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21352625689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10676312694 + 10676312695.

It is an arithmetic number, because the mean of its divisors is an integer number (10676312695).

Almost surely, 2^21352625389 is an apocalyptic number.

It is an amenable number.

21352625389 is a deficient number, since it is larger than the sum of its proper divisors (1).

21352625389 is an equidigital number, since it uses as much as digits as its factorization.

21352625389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 777600, while the sum is 46.

The spelling of 21352625389 in words is "twenty-one billion, three hundred fifty-two million, six hundred twenty-five thousand, three hundred eighty-nine".