21403011 has 16 divisors (see below), whose sum is σ = 32940288. Its totient is φ = 12108000.

The previous prime is 21402977. The next prime is 21403013. The reversal of 21403011 is 11030412.

It is a happy number.

It is not a de Polignac number, because 21403011 - 2⁶ = 21402947 is a prime.

It is a super-2 number, since 2×21403011² = 916177759732242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21403013) 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 15 ways as a sum of consecutive naturals, for example, 2925 + ... + 7166.

It is an arithmetic number, because the mean of its divisors is an integer number (2058768).

Almost surely, 2^21403011 is an apocalyptic number.

21403011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21403011 is a deficient number, since it is larger than the sum of its proper divisors (11537277).

21403011 is a wasteful number, since it uses less digits than its factorization.

21403011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10202.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 21403011 is about 4626.3388332460. The cubic root of 21403011 is about 277.6461303233.

Adding to 21403011 its reverse (11030412), we get a palindrome (32433423).

It can be divided in two parts, 2140 and 3011, that added together give a triangular number (5151 = T₁₀₁).

The spelling of 21403011 in words is "twenty-one million, four hundred three thousand, eleven".