21770552 has 8 divisors (see below), whose sum is σ = 40819800. Its totient is φ = 10885272.

The previous prime is 21770543. The next prime is 21770579. The reversal of 21770552 is 25507712.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1360652 + ... + 1360667.

It is an arithmetic number, because the mean of its divisors is an integer number (5102475).

Almost surely, 2^21770552 is an apocalyptic number.

It is an amenable number.

21770552 is a deficient number, since it is larger than the sum of its proper divisors (19049248).

21770552 is a wasteful number, since it uses less digits than its factorization.

21770552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2721325 (or 2721321 counting only the distinct ones).

The product of its (nonzero) digits is 4900, while the sum is 29.

The square root of 21770552 is about 4665.8924119615. The cubic root of 21770552 is about 279.2264020484.

It can be divided in two parts, 21770 and 552, that added together give a palindrome (22322).

The spelling of 21770552 in words is "twenty-one million, seven hundred seventy thousand, five hundred fifty-two".