21962043 has 32 divisors (see below), whose sum is σ = 35379200. Its totient is φ = 13413600.

The previous prime is 21962041. The next prime is 21962051. The reversal of 21962043 is 34026912.

It is not a de Polignac number, because 21962043 - 2¹ = 21962041 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21961998 and 21962016.

It is not an unprimeable number, because it can be changed into a prime (21962041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15213 + ... + 16593.

It is an arithmetic number, because the mean of its divisors is an integer number (1105600).

Almost surely, 2^21962043 is an apocalyptic number.

21962043 is a deficient number, since it is larger than the sum of its proper divisors (13417157).

21962043 is a wasteful number, since it uses less digits than its factorization.

21962043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1440 (or 1434 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 21962043 is about 4686.3677832624. The cubic root of 21962043 is about 280.0426933199.

Adding to 21962043 its reverse (34026912), we get a palindrome (55988955).

The spelling of 21962043 in words is "twenty-one million, nine hundred sixty-two thousand, forty-three".