22061421 has 6 divisors (see below), whose sum is σ = 31866510. Its totient is φ = 14707608.

The previous prime is 22061419. The next prime is 22061423. The reversal of 22061421 is 12416022.

It is an interprime number because it is at equal distance from previous prime (22061419) and next prime (22061423).

It can be written as a sum of positive squares in only one way, i.e., 19900521 + 2160900 = 4461^2 + 1470^2 .

It is not a de Polignac number, because 22061421 - 2¹ = 22061419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22061394 and 22061403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22061423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1225626 + ... + 1225643.

It is an arithmetic number, because the mean of its divisors is an integer number (5311085).

Almost surely, 2^22061421 is an apocalyptic number.

It is an amenable number.

22061421 is a deficient number, since it is larger than the sum of its proper divisors (9805089).

22061421 is a wasteful number, since it uses less digits than its factorization.

22061421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2451275 (or 2451272 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 22061421 is about 4696.9586968591. The cubic root of 22061421 is about 280.4644544928.

Subtracting from 22061421 its sum of digits (18), we obtain a triangular number (22061403 = T₆₆₄₂).

Adding to 22061421 its reverse (12416022), we get a palindrome (34477443).

The spelling of 22061421 in words is "twenty-two million, sixty-one thousand, four hundred twenty-one".