21550034 has 16 divisors (see below), whose sum is σ = 36797760. Its totient is φ = 9369360.

The previous prime is 21550007. The next prime is 21550043. The reversal of 21550034 is 43005512.

It is a junction number, because it is equal to n+sod(n) for n = 21549988 and 21550015.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20789 + ... + 21800.

It is an arithmetic number, because the mean of its divisors is an integer number (2299860).

Almost surely, 2^21550034 is an apocalyptic number.

21550034 is a deficient number, since it is larger than the sum of its proper divisors (15247726).

21550034 is a wasteful number, since it uses less digits than its factorization.

21550034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42625.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 21550034 is about 4642.2014174312. The cubic root of 21550034 is about 278.2804219723.

Adding to 21550034 its reverse (43005512), we get a palindrome (64555546).

It can be divided in two parts, 21 and 550034, that added together give a palindrome (550055).

The spelling of 21550034 in words is "twenty-one million, five hundred fifty thousand, thirty-four".