215425256021 has 2 divisors, whose sum is σ = 215425256022. Its totient is φ = 215425256020.

The previous prime is 215425256003. The next prime is 215425256041. The reversal of 215425256021 is 120652524512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150244612996 + 65180643025 = 387614^2 + 255305^2 .

It is a cyclic number.

It is not a de Polignac number, because 215425256021 - 2¹⁰ = 215425254997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215425256041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107712628010 + 107712628011.

It is an arithmetic number, because the mean of its divisors is an integer number (107712628011).

Almost surely, 2^215425256021 is an apocalyptic number.

It is an amenable number.

215425256021 is a deficient number, since it is larger than the sum of its proper divisors (1).

215425256021 is an equidigital number, since it uses as much as digits as its factorization.

215425256021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48000, while the sum is 35.

The spelling of 215425256021 in words is "two hundred fifteen billion, four hundred twenty-five million, two hundred fifty-six thousand, twenty-one".