21550722 has 16 divisors (see below), whose sum is σ = 44019072. Its totient is φ = 7030640.

The previous prime is 21550691. The next prime is 21550777. The reversal of 21550722 is 22705512.

It is a junction number, because it is equal to n+sod(n) for n = 21550692 and 21550701.

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, 37929 + ... + 38492.

It is an arithmetic number, because the mean of its divisors is an integer number (2751192).

Almost surely, 2^21550722 is an apocalyptic number.

21550722 is an abundant number, since it is smaller than the sum of its proper divisors (22468350).

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

21550722 is a wasteful number, since it uses less digits than its factorization.

21550722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76473.

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 21550722 is about 4642.2755196132. The cubic root of 21550722 is about 278.2833833736.

The spelling of 21550722 in words is "twenty-one million, five hundred fifty thousand, seven hundred twenty-two".