21316070 has 32 divisors (see below), whose sum is σ = 40186368. Its totient is φ = 8131968.

The previous prime is 21316063. The next prime is 21316091. The reversal of 21316070 is 7061312.

21316070 = 608² + 609² + ... + 660².

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19067 + ... + 20153.

It is an arithmetic number, because the mean of its divisors is an integer number (1255824).

Almost surely, 2^21316070 is an apocalyptic number.

21316070 is a deficient number, since it is larger than the sum of its proper divisors (18870298).

21316070 is a wasteful number, since it uses less digits than its factorization.

21316070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 21316070 is about 4616.9329646422. The cubic root of 21316070 is about 277.2696787592.

Adding to 21316070 its reverse (7061312), we get a palindrome (28377382).

The spelling of 21316070 in words is "twenty-one million, three hundred sixteen thousand, seventy".