21216106511402 has 8 divisors (see below), whose sum is σ = 34717265200512. Its totient is φ = 9643684777900.

The previous prime is 21216106511317. The next prime is 21216106511407. The reversal of 21216106511402 is 20411560161212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21216106511407) 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, 482184238874 + ... + 482184238917.

It is an arithmetic number, because the mean of its divisors is an integer number (4339658150064).

Almost surely, 2^{21216106511402} is an apocalyptic number.

21216106511402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21216106511402 is a deficient number, since it is larger than the sum of its proper divisors (13501158689110).

21216106511402 is a wasteful number, since it uses less digits than its factorization.

21216106511402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964368477804.

The product of its (nonzero) digits is 5760, while the sum is 32.

Adding to 21216106511402 its reverse (20411560161212), we get a palindrome (41627666672614).

The spelling of 21216106511402 in words is "twenty-one trillion, two hundred sixteen billion, one hundred six million, five hundred eleven thousand, four hundred two".