1216551400522 has 16 divisors (see below), whose sum is σ = 1839407754240. Its totient is φ = 603416586528.

The previous prime is 1216551400417. The next prime is 1216551400523. The reversal of 1216551400522 is 2250041556121.

It is a super-2 number, since 2×1216551400522² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1216551400523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1968478 + ... + 2511574.

It is an arithmetic number, because the mean of its divisors is an integer number (114962984640).

Almost surely, 2^{1216551400522} is an apocalyptic number.

1216551400522 is a deficient number, since it is larger than the sum of its proper divisors (622856353718).

1216551400522 is a wasteful number, since it uses less digits than its factorization.

1216551400522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552045.

The product of its (nonzero) digits is 24000, while the sum is 34.

Adding to 1216551400522 its reverse (2250041556121), we get a palindrome (3466592956643).

The spelling of 1216551400522 in words is "one trillion, two hundred sixteen billion, five hundred fifty-one million, four hundred thousand, five hundred twenty-two".