1216771521432 has 16 divisors (see below), whose sum is σ = 3041928803640. Its totient is φ = 405590507136.

The previous prime is 1216771521379. The next prime is 1216771521439. The reversal of 1216771521432 is 2341251776121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216771521439) 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, 25349406673 + ... + 25349406720.

Almost surely, 2^{1216771521432} is an apocalyptic number.

1216771521432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1216771521432 is an abundant number, since it is smaller than the sum of its proper divisors (1825157282208).

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

1216771521432 is a wasteful number, since it uses less digits than its factorization.

1216771521432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50698813402 (or 50698813398 counting only the distinct ones).

The product of its digits is 141120, while the sum is 42.

The spelling of 1216771521432 in words is "one trillion, two hundred sixteen billion, seven hundred seventy-one million, five hundred twenty-one thousand, four hundred thirty-two".