63000021 has 16 divisors (see below), whose sum is σ = 96139904. Its totient is φ = 35947584.

The previous prime is 62999999. The next prime is 63000037. The reversal of 63000021 is 12000036.

It is not a de Polignac number, because 63000021 - 2⁶ = 62999957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 62999970 and 63000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63000061) 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, 16155 + ... + 19671.

It is an arithmetic number, because the mean of its divisors is an integer number (6008744).

Almost surely, 2^63000021 is an apocalyptic number.

It is an amenable number.

63000021 is a deficient number, since it is larger than the sum of its proper divisors (33139883).

63000021 is a wasteful number, since it uses less digits than its factorization.

63000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4380.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 63000021 is about 7937.2552560693. The cubic root of 63000021 is about 397.9057650014.

Adding to 63000021 its reverse (12000036), we get a palindrome (75000057).

The spelling of 63000021 in words is "sixty-three million, twenty-one", and thus it is an aban number and an uban number.