21070136 has 32 divisors (see below), whose sum is σ = 40537200. Its totient is φ = 10264320.

The previous prime is 21070121. The next prime is 21070201. The reversal of 21070136 is 63107012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63491 + ... + 63821.

Almost surely, 2^21070136 is an apocalyptic number.

It is an amenable number.

21070136 is a deficient number, since it is larger than the sum of its proper divisors (19467064).

21070136 is a wasteful number, since it uses less digits than its factorization.

21070136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519 (or 515 counting only the distinct ones).

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

The square root of 21070136 is about 4590.2217811343. The cubic root of 21070136 is about 276.1992190464.

Adding to 21070136 its reverse (63107012), we get a palindrome (84177148).

The spelling of 21070136 in words is "twenty-one million, seventy thousand, one hundred thirty-six".