21422152 has 8 divisors (see below), whose sum is σ = 40166550. Its totient is φ = 10711072.

The previous prime is 21422143. The next prime is 21422221. The reversal of 21422152 is 25122412.

It can be written as a sum of positive squares in only one way, i.e., 15729156 + 5692996 = 3966^2 + 2386^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21422152² = 917817192622208, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1338877 + ... + 1338892.

Almost surely, 2^21422152 is an apocalyptic number.

It is an amenable number.

21422152 is a deficient number, since it is larger than the sum of its proper divisors (18744398).

21422152 is a wasteful number, since it uses less digits than its factorization.

21422152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2677775 (or 2677771 counting only the distinct ones).

The product of its digits is 320, while the sum is 19.

The square root of 21422152 is about 4628.4070693922. The cubic root of 21422152 is about 277.7288732157.

Adding to 21422152 its reverse (25122412), we get a palindrome (46544564).

It can be divided in two parts, 214 and 22152, that added together give a triangular number (22366 = T₂₁₁).

The spelling of 21422152 in words is "twenty-one million, four hundred twenty-two thousand, one hundred fifty-two".