21154533222006 has 24 divisors (see below), whose sum is σ = 45835024586520. Its totient is φ = 7051479903936.

The previous prime is 21154533221993. The next prime is 21154533222019. The reversal of 21154533222006 is 60022233545112.

21154533222006 is a `hidden beast` number, since 2 + 115 + 4 + 5 + 332 + 2 + 200 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (21154533221993) and next prime (21154533222019).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1787790 + ... + 6745758.

It is an arithmetic number, because the mean of its divisors is an integer number (1909792691105).

Almost surely, 2^{21154533222006} is an apocalyptic number.

21154533222006 is an abundant number, since it is smaller than the sum of its proper divisors (24680491364514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21154533222006 is a wasteful number, since it uses less digits than its factorization.

21154533222006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5195020 (or 5195017 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

Adding to 21154533222006 its reverse (60022233545112), we get a palindrome (81176766767118).

The spelling of 21154533222006 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred thirty-three million, two hundred twenty-two thousand, six".