21632276027 has 4 divisors (see below), whose sum is σ = 21712693680. Its totient is φ = 21551858376.

The previous prime is 21632275993. The next prime is 21632276053. The reversal of 21632276027 is 72067223612.

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

It is a cyclic number.

It is not a de Polignac number, because 21632276027 - 2¹² = 21632271931 is a prime.

It is a super-2 number, since 2×21632276027² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21632270027) 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, 40208423 + ... + 40208960.

It is an arithmetic number, because the mean of its divisors is an integer number (5428173420).

Almost surely, 2^21632276027 is an apocalyptic number.

21632276027 is a deficient number, since it is larger than the sum of its proper divisors (80417653).

21632276027 is an equidigital number, since it uses as much as digits as its factorization.

21632276027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80417652.

The product of its (nonzero) digits is 84672, while the sum is 38.

Adding to 21632276027 its reverse (72067223612), we get a palindrome (93699499639).

The spelling of 21632276027 in words is "twenty-one billion, six hundred thirty-two million, two hundred seventy-six thousand, twenty-seven".