21307100650 has 48 divisors (see below), whose sum is σ = 45509542560. Its totient is φ = 7340241600.

The previous prime is 21307100627. The next prime is 21307100653. The reversal of 21307100650 is 5600170312.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (21307100653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1009029 + ... + 1029928.

It is an arithmetic number, because the mean of its divisors is an integer number (948115470).

Almost surely, 2^21307100650 is an apocalyptic number.

21307100650 is an abundant number, since it is smaller than the sum of its proper divisors (24202441910).

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

21307100650 is a wasteful number, since it uses less digits than its factorization.

21307100650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2038999 (or 2038994 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 25.

Adding to 21307100650 its reverse (5600170312), we get a palindrome (26907270962).

The spelling of 21307100650 in words is "twenty-one billion, three hundred seven million, one hundred thousand, six hundred fifty".