63020021 has 4 divisors (see below), whose sum is σ = 64209132. Its totient is φ = 61830912.

The previous prime is 63019961. The next prime is 63020029. The reversal of 63020021 is 12002036.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56415121 + 6604900 = 7511^2 + 2570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63020021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63019978 and 63020005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63020029) 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, 594476 + ... + 594581.

It is an arithmetic number, because the mean of its divisors is an integer number (16052283).

Almost surely, 2^63020021 is an apocalyptic number.

It is an amenable number.

63020021 is a deficient number, since it is larger than the sum of its proper divisors (1189111).

63020021 is a wasteful number, since it uses less digits than its factorization.

63020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189110.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 63020021 is about 7938.5150374614. The cubic root of 63020021 is about 397.9478669626.

Adding to 63020021 its reverse (12002036), we get a palindrome (75022057).

The spelling of 63020021 in words is "sixty-three million, twenty thousand, twenty-one".