63121021 has 4 divisors (see below), whose sum is σ = 66443200. Its totient is φ = 59798844.

The previous prime is 63121013. The next prime is 63121027. The reversal of 63121021 is 12012136.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63121021 - 2³ = 63121013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63120986 and 63121004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63121027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1661061 + ... + 1661098.

It is an arithmetic number, because the mean of its divisors is an integer number (16610800).

Almost surely, 2^63121021 is an apocalyptic number.

It is an amenable number.

63121021 is a deficient number, since it is larger than the sum of its proper divisors (3322179).

63121021 is a wasteful number, since it uses less digits than its factorization.

63121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3322178.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 63121021 is about 7944.8738819443. The cubic root of 63121021 is about 398.1603459028.

Adding to 63121021 its reverse (12012136), we get a palindrome (75133157).

The spelling of 63121021 in words is "sixty-three million, one hundred twenty-one thousand, twenty-one".