21154212650 has 96 divisors (see below), whose sum is σ = 42290864640. Its totient is φ = 7844480000.

The previous prime is 21154212641. The next prime is 21154212691. The reversal of 21154212650 is 5621245112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20517635 + ... + 20518665.

It is an arithmetic number, because the mean of its divisors is an integer number (440529840).

Almost surely, 2^21154212650 is an apocalyptic number.

21154212650 is a deficient number, since it is larger than the sum of its proper divisors (21136651990).

21154212650 is a wasteful number, since it uses less digits than its factorization.

21154212650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1400 (or 1395 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

Adding to 21154212650 its reverse (5621245112), we get a palindrome (26775457762).

The spelling of 21154212650 in words is "twenty-one billion, one hundred fifty-four million, two hundred twelve thousand, six hundred fifty".