63156021 has 16 divisors (see below), whose sum is σ = 87833088. Its totient is φ = 40320000.

The previous prime is 63155977. The next prime is 63156047. The reversal of 63156021 is 12065136.

It is not a de Polignac number, because 63156021 - 2¹¹ = 63153973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 63155982 and 63156000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63156221) 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, 5521 + ... + 12521.

It is an arithmetic number, because the mean of its divisors is an integer number (5489568).

Almost surely, 2^63156021 is an apocalyptic number.

It is an amenable number.

63156021 is a deficient number, since it is larger than the sum of its proper divisors (24677067).

63156021 is a wasteful number, since it uses less digits than its factorization.

63156021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7132.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 63156021 is about 7947.0762548248. The cubic root of 63156021 is about 398.2339243344.

The spelling of 63156021 in words is "sixty-three million, one hundred fifty-six thousand, twenty-one".