21350836 has 24 divisors (see below), whose sum is σ = 40811904. Its totient is φ = 9713760.

The previous prime is 21350809. The next prime is 21350839. The reversal of 21350836 is 63805312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21350839) 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, 801 + ... + 6583.

It is an arithmetic number, because the mean of its divisors is an integer number (1700496).

Almost surely, 2^21350836 is an apocalyptic number.

21350836 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21350836 is a deficient number, since it is larger than the sum of its proper divisors (19461068).

21350836 is a wasteful number, since it uses less digits than its factorization.

21350836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5871 (or 5869 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 21350836 is about 4620.6964842976. The cubic root of 21350836 is about 277.4203369523.

The spelling of 21350836 in words is "twenty-one million, three hundred fifty thousand, eight hundred thirty-six".