21650542067 has 16 divisors (see below), whose sum is σ = 27002460672. Its totient is φ = 16864566720.

The previous prime is 21650542051. The next prime is 21650542087. The reversal of 21650542067 is 76024505612.

It is a cyclic number.

It is not a de Polignac number, because 21650542067 - 2⁴ = 21650542051 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21650542067.

It is not an unprimeable number, because it can be changed into a prime (21650542007) 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, 175103 + ... + 271959.

It is an arithmetic number, because the mean of its divisors is an integer number (1687653792).

Almost surely, 2^21650542067 is an apocalyptic number.

21650542067 is a deficient number, since it is larger than the sum of its proper divisors (5351918605).

21650542067 is a wasteful number, since it uses less digits than its factorization.

21650542067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99778.

The product of its (nonzero) digits is 100800, while the sum is 38.

The spelling of 21650542067 in words is "twenty-one billion, six hundred fifty million, five hundred forty-two thousand, sixty-seven".