21250225666531 has 2 divisors, whose sum is σ = 21250225666532. Its totient is φ = 21250225666530.

The previous prime is 21250225666519. The next prime is 21250225666543. The reversal of 21250225666531 is 13566652205212.

It is a balanced prime because it is at equal distance from previous prime (21250225666519) and next prime (21250225666543).

It is a cyclic number.

It is not a de Polignac number, because 21250225666531 - 2⁵ = 21250225666499 is a prime.

It is a super-2 number, since 2×21250225666531² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21250225666591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10625112833265 + 10625112833266.

It is an arithmetic number, because the mean of its divisors is an integer number (10625112833266).

Almost surely, 2^{21250225666531} is an apocalyptic number.

21250225666531 is a deficient number, since it is larger than the sum of its proper divisors (1).

21250225666531 is an equidigital number, since it uses as much as digits as its factorization.

21250225666531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296000, while the sum is 46.

The spelling of 21250225666531 in words is "twenty-one trillion, two hundred fifty billion, two hundred twenty-five million, six hundred sixty-six thousand, five hundred thirty-one".