21246436650 has 48 divisors (see below), whose sum is σ = 52811352000. Its totient is φ = 5652792960.

The previous prime is 21246436649. The next prime is 21246436657. The reversal of 21246436650 is 5663464212.

It is a super-2 number, since 2×21246436650² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21246436599 and 21246436608.

It is not an unprimeable number, because it can be changed into a prime (21246436657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 95475 + ... + 227174.

It is an arithmetic number, because the mean of its divisors is an integer number (1100236500).

Almost surely, 2^21246436650 is an apocalyptic number.

21246436650 is an abundant number, since it is smaller than the sum of its proper divisors (31564915350).

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

21246436650 is a wasteful number, since it uses less digits than its factorization.

21246436650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323103 (or 323098 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 39.

The spelling of 21246436650 in words is "twenty-one billion, two hundred forty-six million, four hundred thirty-six thousand, six hundred fifty".