21074070 has 16 divisors (see below), whose sum is σ = 50577840. Its totient is φ = 5619744.

The previous prime is 21074069. The next prime is 21074071. The reversal of 21074070 is 7047012.

It is an interprime number because it is at equal distance from previous prime (21074069) and next prime (21074071).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21074071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351205 + ... + 351264.

It is an arithmetic number, because the mean of its divisors is an integer number (3161115).

Almost surely, 2^21074070 is an apocalyptic number.

21074070 is an abundant number, since it is smaller than the sum of its proper divisors (29503770).

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

21074070 is a wasteful number, since it uses less digits than its factorization.

21074070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702479.

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 21074070 is about 4590.6502807337. The cubic root of 21074070 is about 276.2164076732.

The spelling of 21074070 in words is "twenty-one million, seventy-four thousand, seventy".