21214040356356 has 48 divisors (see below), whose sum is σ = 50062756060800. Its totient is φ = 6990893992192.

The previous prime is 21214040356343. The next prime is 21214040356423. The reversal of 21214040356356 is 65365304041212.

It is a super-2 number, since 2×21214040356356² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6073705 + ... + 8906063.

It is an arithmetic number, because the mean of its divisors is an integer number (1042974084600).

Almost surely, 2^{21214040356356} is an apocalyptic number.

It is an amenable number.

21214040356356 is an abundant number, since it is smaller than the sum of its proper divisors (28848715704444).

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

21214040356356 is a wasteful number, since it uses less digits than its factorization.

21214040356356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2839468 (or 2839466 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 42.

Adding to 21214040356356 its reverse (65365304041212), we get a palindrome (86579344397568).

The spelling of 21214040356356 in words is "twenty-one trillion, two hundred fourteen billion, forty million, three hundred fifty-six thousand, three hundred fifty-six".