20150025221 has 2 divisors, whose sum is σ = 20150025222. Its totient is φ = 20150025220.

The previous prime is 20150025187. The next prime is 20150025229. The reversal of 20150025221 is 12252005102.

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., 19479784900 + 670240321 = 139570^2 + 25889^2 .

It is a cyclic number.

It is not a de Polignac number, because 20150025221 - 2³⁰ = 19076283397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20150025193 and 20150025202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20150025229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10075012610 + 10075012611.

It is an arithmetic number, because the mean of its divisors is an integer number (10075012611).

Almost surely, 2^20150025221 is an apocalyptic number.

It is an amenable number.

20150025221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20150025221 is an equidigital number, since it uses as much as digits as its factorization.

20150025221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 20.

The spelling of 20150025221 in words is "twenty billion, one hundred fifty million, twenty-five thousand, two hundred twenty-one".