21205450150 has 24 divisors (see below), whose sum is σ = 39576779424. Its totient is φ = 8453224800.

The previous prime is 21205450127. The next prime is 21205450159. The reversal of 21205450150 is 5105450212.

It is a super-4 number, since 4×21205450150⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21205450159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 709086 + ... + 738385.

It is an arithmetic number, because the mean of its divisors is an integer number (1649032476).

Almost surely, 2^21205450150 is an apocalyptic number.

21205450150 is a deficient number, since it is larger than the sum of its proper divisors (18371329274).

21205450150 is a wasteful number, since it uses less digits than its factorization.

21205450150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1447776 (or 1447771 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The spelling of 21205450150 in words is "twenty-one billion, two hundred five million, four hundred fifty thousand, one hundred fifty".