21069370 has 64 divisors (see below), whose sum is σ = 45722880. Its totient is φ = 6838272.

The previous prime is 21069361. The next prime is 21069383. The reversal of 21069370 is 7396012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 196857 + ... + 196963.

It is an arithmetic number, because the mean of its divisors is an integer number (714420).

Almost surely, 2^21069370 is an apocalyptic number.

21069370 is an abundant number, since it is smaller than the sum of its proper divisors (24653510).

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

21069370 is a wasteful number, since it uses less digits than its factorization.

21069370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 21069370 is about 4590.1383421418. The cubic root of 21069370 is about 276.1958719526.

It can be divided in two parts, 2106 and 9370, that added together give a triangular number (11476 = T₁₅₁).

The spelling of 21069370 in words is "twenty-one million, sixty-nine thousand, three hundred seventy".