21625011 has 12 divisors (see below), whose sum is σ = 32244160. Its totient is φ = 13951440.

The previous prime is 21624973. The next prime is 21625027. The reversal of 21625011 is 11052612.

21625011 is a `hidden beast` number, since 2 + 162 + 501 + 1 = 666.

It is not a de Polignac number, because 21625011 - 2⁶ = 21624947 is a prime.

It is a super-2 number, since 2×21625011² = 935282201500242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21625031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38476 + ... + 39033.

Almost surely, 2^21625011 is an apocalyptic number.

21625011 is a deficient number, since it is larger than the sum of its proper divisors (10619149).

21625011 is a wasteful number, since it uses less digits than its factorization.

21625011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77546 (or 77543 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 21625011 is about 4650.2699921617. The cubic root of 21625011 is about 278.6027800161.

Adding to 21625011 its reverse (11052612), we get a palindrome (32677623).

The spelling of 21625011 in words is "twenty-one million, six hundred twenty-five thousand, eleven".