1216511201622 has 16 divisors (see below), whose sum is σ = 2433039448752. Its totient is φ = 405500892960.

The previous prime is 1216511201617. The next prime is 1216511201627. The reversal of 1216511201622 is 2261021156121.

It is an interprime number because it is at equal distance from previous prime (1216511201617) and next prime (1216511201627).

It is a self number, because there is not a number n which added to its sum of digits gives 1216511201622.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216511201627) 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, 336148 + ... + 1595624.

It is an arithmetic number, because the mean of its divisors is an integer number (152064965547).

Almost surely, 2^{1216511201622} is an apocalyptic number.

1216511201622 is an abundant number, since it is smaller than the sum of its proper divisors (1216528247130).

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

1216511201622 is a wasteful number, since it uses less digits than its factorization.

1216511201622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1420463.

The product of its (nonzero) digits is 2880, while the sum is 30.

Adding to 1216511201622 its reverse (2261021156121), we get a palindrome (3477532357743).

The spelling of 1216511201622 in words is "one trillion, two hundred sixteen billion, five hundred eleven million, two hundred one thousand, six hundred twenty-two".