25000045000021 has 16 divisors (see below), whose sum is σ = 30769953222400. Its totient is φ = 19779826555008.

The previous prime is 25000044999997. The next prime is 25000045000061. The reversal of 25000045000021 is 12000054000052.

It is not a de Polignac number, because 25000045000021 - 2¹¹ = 25000044997973 is a prime.

It is the 5000005-th Hogben number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25000045000061) by changing a digit.

It is a nontrivial repunit in base 5000004.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1275760 + ... + 7185238.

It is an arithmetic number, because the mean of its divisors is an integer number (1923122076400).

Almost surely, 2^{25000045000021} is an apocalyptic number.

It is an amenable number.

25000045000021 is a deficient number, since it is larger than the sum of its proper divisors (5769908222379).

25000045000021 is a wasteful number, since it uses less digits than its factorization.

25000045000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5955988.

The product of its (nonzero) digits is 400, while the sum is 19.

Adding to 25000045000021 its reverse (12000054000052), we get a palindrome (37000099000073).

The spelling of 25000045000021 in words is "twenty-five trillion, forty-five million, twenty-one", and thus it is an aban number and an uban number.