21000000411025 has 24 divisors (see below), whose sum is σ = 27629326609920. Its totient is φ = 15778754914560.

The previous prime is 21000000410999. The next prime is 21000000411029. The reversal of 21000000411025 is 52011400000012.

It is not a de Polignac number, because 21000000411025 - 2⁹ = 21000000410513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21000000411029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51374469 + ... + 51781618.

It is an arithmetic number, because the mean of its divisors is an integer number (1151221942080).

Almost surely, 2^{21000000411025} is an apocalyptic number.

21000000411025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21000000411025 is a deficient number, since it is larger than the sum of its proper divisors (6629326198895).

21000000411025 is a wasteful number, since it uses less digits than its factorization.

21000000411025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103156593 (or 103156588 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 21000000411025 its reverse (52011400000012), we get a palindrome (73011400411037).

The spelling of 21000000411025 in words is "twenty-one trillion, four hundred eleven thousand, twenty-five".