21216405065462 has 16 divisors (see below), whose sum is σ = 32890931269632. Its totient is φ = 10253588880360.

The previous prime is 21216405065423. The next prime is 21216405065483. The reversal of 21216405065462 is 26456050461212.

It is a super-2 number, since 2×21216405065462² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206841158 + ... + 206943705.

It is an arithmetic number, because the mean of its divisors is an integer number (2055683204352).

Almost surely, 2^{21216405065462} is an apocalyptic number.

21216405065462 is a deficient number, since it is larger than the sum of its proper divisors (11674526204170).

21216405065462 is a wasteful number, since it uses less digits than its factorization.

21216405065462 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413785723.

The product of its (nonzero) digits is 691200, while the sum is 44.

The spelling of 21216405065462 in words is "twenty-one trillion, two hundred sixteen billion, four hundred five million, sixty-five thousand, four hundred sixty-two".