21152061 has 12 divisors (see below), whose sum is σ = 34917792. Its totient is φ = 12086856.

The previous prime is 21152051. The next prime is 21152069. The reversal of 21152061 is 16025112.

It is not a de Polignac number, because 21152061 - 2¹⁴ = 21135677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152069) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 167811 + ... + 167936.

It is an arithmetic number, because the mean of its divisors is an integer number (2909816).

Almost surely, 2^21152061 is an apocalyptic number.

21152061 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21152061 is a deficient number, since it is larger than the sum of its proper divisors (13765731).

21152061 is a wasteful number, since it uses less digits than its factorization.

21152061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335760 (or 335757 counting only the distinct ones).

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

The square root of 21152061 is about 4599.1369842613. The cubic root of 21152061 is about 276.5567291145.

Adding to 21152061 its reverse (16025112), we get a palindrome (37177173).

The spelling of 21152061 in words is "twenty-one million, one hundred fifty-two thousand, sixty-one".