21059061 has 8 divisors (see below), whose sum is σ = 28114944. Its totient is φ = 14021280.

The previous prime is 21059057. The next prime is 21059063. The reversal of 21059061 is 16095012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21059061 - 2² = 21059057 is a prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21059063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1525 + ... + 6666.

It is an arithmetic number, because the mean of its divisors is an integer number (3514368).

Almost surely, 2^21059061 is an apocalyptic number.

It is an amenable number.

21059061 is a deficient number, since it is larger than the sum of its proper divisors (7055883).

21059061 is an equidigital number, since it uses as much as digits as its factorization.

21059061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9051.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 21059061 is about 4589.0152538426. The cubic root of 21059061 is about 276.1508181177.

The spelling of 21059061 in words is "twenty-one million, fifty-nine thousand, sixty-one".