21770034 has 32 divisors (see below), whose sum is σ = 51153984. Its totient is φ = 6089280.

The previous prime is 21770033. The next prime is 21770059. The reversal of 21770034 is 43007712.

It is a super-2 number, since 2×21770034² = 947868760722312, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21769986 and 21770013.

It is not an unprimeable number, because it can be changed into a prime (21770033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11829 + ... + 13544.

It is an arithmetic number, because the mean of its divisors is an integer number (1598562).

Almost surely, 2^21770034 is an apocalyptic number.

21770034 is an abundant number, since it is smaller than the sum of its proper divisors (29383950).

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

21770034 is a wasteful number, since it uses less digits than its factorization.

21770034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25402.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 21770034 is about 4665.8369024217. The cubic root of 21770034 is about 279.2241874295.

Adding to 21770034 its reverse (43007712), we get a palindrome (64777746).

The spelling of 21770034 in words is "twenty-one million, seven hundred seventy thousand, thirty-four".