21203003252 has 6 divisors (see below), whose sum is σ = 37105255698. Its totient is φ = 10601501624.

The previous prime is 21203003251. The next prime is 21203003267. The reversal of 21203003252 is 25230030212.

It can be written as a sum of positive squares in only one way, i.e., 13216721296 + 7986281956 = 114964^2 + 89366^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203003251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2650375403 + ... + 2650375410.

It is an arithmetic number, because the mean of its divisors is an integer number (6184209283).

Almost surely, 2^21203003252 is an apocalyptic number.

It is an amenable number.

21203003252 is a deficient number, since it is larger than the sum of its proper divisors (15902252446).

21203003252 is a wasteful number, since it uses less digits than its factorization.

21203003252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5300750817 (or 5300750815 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

Adding to 21203003252 its reverse (25230030212), we get a palindrome (46433033464).

The spelling of 21203003252 in words is "twenty-one billion, two hundred three million, three thousand, two hundred fifty-two".