21210212222025 has 24 divisors (see below), whose sum is σ = 35102724067584. Its totient is φ = 11300766993600.

The previous prime is 21210212222021. The next prime is 21210212222033. The reversal of 21210212222025 is 52022221201212.

It is not a de Polignac number, because 21210212222025 - 2² = 21210212222021 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21210212221986 and 21210212222004.

It is not an unprimeable number, because it can be changed into a prime (21210212222021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 141752121 + ... + 141901670.

It is an arithmetic number, because the mean of its divisors is an integer number (1462613502816).

Almost surely, 2^{21210212222025} is an apocalyptic number.

21210212222025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21210212222025 is a deficient number, since it is larger than the sum of its proper divisors (13892511845559).

21210212222025 is a wasteful number, since it uses less digits than its factorization.

21210212222025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283654801 (or 283654796 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

Adding to 21210212222025 its reverse (52022221201212), we get a palindrome (73232433423237).

The spelling of 21210212222025 in words is "twenty-one trillion, two hundred ten billion, two hundred twelve million, two hundred twenty-two thousand, twenty-five".