21180063 has 16 divisors (see below), whose sum is σ = 29443680. Its totient is φ = 13526016.

The previous prime is 21180053. The next prime is 21180073. The reversal of 21180063 is 36008112.

It is an interprime number because it is at equal distance from previous prime (21180053) and next prime (21180073).

It is not a de Polignac number, because 21180063 - 2¹⁷ = 21048991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21180043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11031 + ... + 12807.

It is an arithmetic number, because the mean of its divisors is an integer number (1840230).

Almost surely, 2^21180063 is an apocalyptic number.

21180063 is a deficient number, since it is larger than the sum of its proper divisors (8263617).

21180063 is a wasteful number, since it uses less digits than its factorization.

21180063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1946.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 21180063 is about 4602.1802441886. The cubic root of 21180063 is about 276.6787144961.

Adding to 21180063 its reverse (36008112), we get a palindrome (57188175).

The spelling of 21180063 in words is "twenty-one million, one hundred eighty thousand, sixty-three".