63401021 has 8 divisors (see below), whose sum is σ = 64572504. Its totient is φ = 62233920.

The previous prime is 63401003. The next prime is 63401053. The reversal of 63401021 is 12010436.

It can be written as a sum of positive squares in 4 ways, for example, as 13980121 + 49420900 = 3739^2 + 7030^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 63401021 - 2⁶ = 63400957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63401071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45491 + ... + 46863.

It is an arithmetic number, because the mean of its divisors is an integer number (8071563).

Almost surely, 2^63401021 is an apocalyptic number.

63401021 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

63401021 is a deficient number, since it is larger than the sum of its proper divisors (1171483).

63401021 is a wasteful number, since it uses less digits than its factorization.

63401021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2191.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 63401021 is about 7962.4758084405. The cubic root of 63401021 is about 398.7482137478.

Adding to 63401021 its reverse (12010436), we get a palindrome (75411457).

The spelling of 63401021 in words is "sixty-three million, four hundred one thousand, twenty-one".