21194140154 has 16 divisors (see below), whose sum is σ = 34728276960. Its totient is φ = 9620656560.

The previous prime is 21194140141. The next prime is 21194140169. The reversal of 21194140154 is 45104149112.

It is a self number, because there is not a number n which added to its sum of digits gives 21194140154.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 635549 + ... + 668064.

It is an arithmetic number, because the mean of its divisors is an integer number (2170517310).

Almost surely, 2^21194140154 is an apocalyptic number.

21194140154 is a deficient number, since it is larger than the sum of its proper divisors (13534136806).

21194140154 is a wasteful number, since it uses less digits than its factorization.

21194140154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1304365.

The product of its (nonzero) digits is 5760, while the sum is 32.

Adding to 21194140154 its reverse (45104149112), we get a palindrome (66298289266).

The spelling of 21194140154 in words is "twenty-one billion, one hundred ninety-four million, one hundred forty thousand, one hundred fifty-four".