21224220154 has 16 divisors (see below), whose sum is σ = 31890228840. Its totient is φ = 10594160640.

The previous prime is 21224220139. The next prime is 21224220167. The reversal of 21224220154 is 45102242212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 19590201225 + 1634018929 = 139965^2 + 40423^2 .

It is a super-2 number, since 2×21224220154² (a number of 21 digits) contains 22 as substring.

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, 3898074 + ... + 3903514.

Almost surely, 2^21224220154 is an apocalyptic number.

21224220154 is a deficient number, since it is larger than the sum of its proper divisors (10666008686).

21224220154 is a wasteful number, since it uses less digits than its factorization.

21224220154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8385.

The product of its (nonzero) digits is 2560, while the sum is 25.

Adding to 21224220154 its reverse (45102242212), we get a palindrome (66326462366).

The spelling of 21224220154 in words is "twenty-one billion, two hundred twenty-four million, two hundred twenty thousand, one hundred fifty-four".