21670505050 has 24 divisors (see below), whose sum is σ = 41607372672. Its totient is φ = 8388582000.

The previous prime is 21670505039. The next prime is 21670505071. The reversal of 21670505050 is 5050507612.

It is a super-2 number, since 2×21670505050² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 6988936 + ... + 6992035.

It is an arithmetic number, because the mean of its divisors is an integer number (1733640528).

Almost surely, 2^21670505050 is an apocalyptic number.

21670505050 is a deficient number, since it is larger than the sum of its proper divisors (19936867622).

21670505050 is a wasteful number, since it uses less digits than its factorization.

21670505050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13981014 (or 13981009 counting only the distinct ones).

The product of its (nonzero) digits is 10500, while the sum is 31.

The spelling of 21670505050 in words is "twenty-one billion, six hundred seventy million, five hundred five thousand, fifty".