21153426 has 16 divisors (see below), whose sum is σ = 48350784. Its totient is φ = 6043824.

The previous prime is 21153409. The next prime is 21153427. The reversal of 21153426 is 62435112.

It is a junction number, because it is equal to n+sod(n) for n = 21153396 and 21153405.

It is not an unprimeable number, because it can be changed into a prime (21153427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251785 + ... + 251868.

It is an arithmetic number, because the mean of its divisors is an integer number (3021924).

Almost surely, 2^21153426 is an apocalyptic number.

21153426 is an abundant number, since it is smaller than the sum of its proper divisors (27197358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21153426 is a wasteful number, since it uses less digits than its factorization.

21153426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503665.

The product of its digits is 1440, while the sum is 24.

The square root of 21153426 is about 4599.2853792736. The cubic root of 21153426 is about 276.5626779724.

Adding to 21153426 its reverse (62435112), we get a palindrome (83588538).

The spelling of 21153426 in words is "twenty-one million, one hundred fifty-three thousand, four hundred twenty-six".