21622154 has 4 divisors (see below), whose sum is σ = 32433234. Its totient is φ = 10811076.

The previous prime is 21622151. The next prime is 21622157. The reversal of 21622154 is 45122612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21622151) and next prime (21622157).

It can be written as a sum of positive squares in only one way, i.e., 19562929 + 2059225 = 4423^2 + 1435^2 .

It is not an unprimeable number, because it can be changed into a prime (21622151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5405537 + ... + 5405540.

Almost surely, 2^21622154 is an apocalyptic number.

21622154 is a deficient number, since it is larger than the sum of its proper divisors (10811080).

21622154 is a wasteful number, since it uses less digits than its factorization.

21622154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10811079.

The product of its digits is 960, while the sum is 23.

The square root of 21622154 is about 4649.9627955501. The cubic root of 21622154 is about 278.5905102235.

Adding to 21622154 its reverse (45122612), we get a palindrome (66744766).

The spelling of 21622154 in words is "twenty-one million, six hundred twenty-two thousand, one hundred fifty-four".