21942466 has 16 divisors (see below), whose sum is σ = 40509504. Its totient is φ = 8680464.

The previous prime is 21942457. The next prime is 21942469. The reversal of 21942466 is 66424912.

It is a super-2 number, since 2×21942466² = 962943628322312, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21942469) 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 7 ways as a sum of consecutive naturals, for example, 60100 + ... + 60463.

It is an arithmetic number, because the mean of its divisors is an integer number (2531844).

Almost surely, 2^21942466 is an apocalyptic number.

21942466 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21942466 is a deficient number, since it is larger than the sum of its proper divisors (18567038).

21942466 is a wasteful number, since it uses less digits than its factorization.

21942466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120585.

The product of its digits is 20736, while the sum is 34.

The square root of 21942466 is about 4684.2785997419. The cubic root of 21942466 is about 279.9594584159.

The spelling of 21942466 in words is "twenty-one million, nine hundred forty-two thousand, four hundred sixty-six".