21621272070162 has 32 divisors (see below), whose sum is σ = 43898031778752. Its totient is φ = 7097892145344.

The previous prime is 21621272070133. The next prime is 21621272070169. The reversal of 21621272070162 is 26107027212612.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21621272070162.

It is not an unprimeable number, because it can be changed into a prime (21621272070169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4420653 + ... + 7923680.

It is an arithmetic number, because the mean of its divisors is an integer number (1371813493086).

Almost surely, 2^{21621272070162} is an apocalyptic number.

21621272070162 is an abundant number, since it is smaller than the sum of its proper divisors (22276759708590).

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

21621272070162 is a wasteful number, since it uses less digits than its factorization.

21621272070162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12348762.

The product of its (nonzero) digits is 56448, while the sum is 39.

Adding to 21621272070162 its reverse (26107027212612), we get a palindrome (47728299282774).

The spelling of 21621272070162 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred seventy-two million, seventy thousand, one hundred sixty-two".