21203202125 has 32 divisors (see below), whose sum is σ = 30300521472. Its totient is φ = 14511120000.

The previous prime is 21203202067. The next prime is 21203202131. The reversal of 21203202125 is 52120230212.

It is not a de Polignac number, because 21203202125 - 2⁶ = 21203202061 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21203202097 and 21203202106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 432620 + ... + 479130.

It is an arithmetic number, because the mean of its divisors is an integer number (946891296).

Almost surely, 2^21203202125 is an apocalyptic number.

21203202125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21203202125 is a deficient number, since it is larger than the sum of its proper divisors (9097319347).

21203202125 is an equidigital number, since it uses as much as digits as its factorization.

21203202125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47054 (or 47044 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 21203202125 its reverse (52120230212), we get a palindrome (73323432337).

The spelling of 21203202125 in words is "twenty-one billion, two hundred three million, two hundred two thousand, one hundred twenty-five".