21003425252 has 6 divisors (see below), whose sum is σ = 36755994198. Its totient is φ = 10501712624.

The previous prime is 21003425249. The next prime is 21003425309. The reversal of 21003425252 is 25252430012.

It can be written as a sum of positive squares in only one way, i.e., 20576754916 + 426670336 = 143446^2 + 20656^2 .

It is a super-2 number, since 2×21003425252² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625428153 + ... + 2625428160.

It is an arithmetic number, because the mean of its divisors is an integer number (6125999033).

Almost surely, 2^21003425252 is an apocalyptic number.

It is an amenable number.

21003425252 is a deficient number, since it is larger than the sum of its proper divisors (15752568946).

21003425252 is a wasteful number, since it uses less digits than its factorization.

21003425252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5250856317 (or 5250856315 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 21003425252 its reverse (25252430012), we get a palindrome (46255855264).

The spelling of 21003425252 in words is "twenty-one billion, three million, four hundred twenty-five thousand, two hundred fifty-two".