25630000021 has 8 divisors (see below), whose sum is σ = 26774725824. Its totient is φ = 24487805760.

The previous prime is 25630000001. The next prime is 25630000051. The reversal of 25630000021 is 12000003652.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25630000021 - 2¹¹ = 25629997973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25630000001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 612171 + ... + 652696.

It is an arithmetic number, because the mean of its divisors is an integer number (3346840728).

Almost surely, 2^25630000021 is an apocalyptic number.

It is an amenable number.

25630000021 is a deficient number, since it is larger than the sum of its proper divisors (1144725803).

25630000021 is a wasteful number, since it uses less digits than its factorization.

25630000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1265771.

The product of its (nonzero) digits is 360, while the sum is 19.

Adding to 25630000021 its reverse (12000003652), we get a palindrome (37630003673).

The spelling of 25630000021 in words is "twenty-five billion, six hundred thirty million, twenty-one", and thus it is an aban number.