21269494 has 4 divisors (see below), whose sum is σ = 31904244. Its totient is φ = 10634746.

The previous prime is 21269471. The next prime is 21269527. The reversal of 21269494 is 49496212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5317372 + ... + 5317375.

It is an arithmetic number, because the mean of its divisors is an integer number (7976061).

Almost surely, 2^21269494 is an apocalyptic number.

21269494 is a deficient number, since it is larger than the sum of its proper divisors (10634750).

21269494 is a wasteful number, since it uses less digits than its factorization.

21269494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10634749.

The product of its digits is 31104, while the sum is 37.

The square root of 21269494 is about 4611.8861651173. The cubic root of 21269494 is about 277.0675850674.

It can be divided in two parts, 2126949 and 4, that added together give a triangular number (2126953 = T₂₀₆₂).

The spelling of 21269494 in words is "twenty-one million, two hundred sixty-nine thousand, four hundred ninety-four".