21445304250 has 64 divisors (see below), whose sum is σ = 55373310720. Its totient is φ = 5521544000.

The previous prime is 21445304249. The next prime is 21445304263. The reversal of 21445304250 is 5240354412.

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 31 ways as a sum of consecutive naturals, for example, 471246 + ... + 514745.

It is an arithmetic number, because the mean of its divisors is an integer number (865207980).

Almost surely, 2^21445304250 is an apocalyptic number.

21445304250 is an abundant number, since it is smaller than the sum of its proper divisors (33928006470).

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

21445304250 is a wasteful number, since it uses less digits than its factorization.

21445304250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986040 (or 986030 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 21445304250 its reverse (5240354412), we get a palindrome (26685658662).

The spelling of 21445304250 in words is "twenty-one billion, four hundred forty-five million, three hundred four thousand, two hundred fifty".