21325415250 has 32 divisors (see below), whose sum is σ = 53228238336. Its totient is φ = 5686777200.

The previous prime is 21325415249. The next prime is 21325415269. The reversal of 21325415250 is 5251452312.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14216194 + ... + 14217693.

It is an arithmetic number, because the mean of its divisors is an integer number (1663382448).

Almost surely, 2^21325415250 is an apocalyptic number.

21325415250 is an abundant number, since it is smaller than the sum of its proper divisors (31902823086).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21325415250 is a wasteful number, since it uses less digits than its factorization.

21325415250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28433907 (or 28433897 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 21325415250 its reverse (5251452312), we get a palindrome (26576867562).

The spelling of 21325415250 in words is "twenty-one billion, three hundred twenty-five million, four hundred fifteen thousand, two hundred fifty".