1213021957968 has 100 divisors (see below), whose sum is σ = 3592485020608. Its totient is φ = 394937363520.

The previous prime is 1213021957951. The next prime is 1213021957969. The reversal of 1213021957968 is 8697591203121.

It is a happy number.

1213021957968 is a `hidden beast` number, since 1 + 2 + 1 + 3 + 0 + 2 + 1 + 9 + 579 + 68 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213021957969) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10827688 + ... + 10939143.

Almost surely, 2^{1213021957968} is an apocalyptic number.

1213021957968 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1213021957968 is an abundant number, since it is smaller than the sum of its proper divisors (2379463062640).

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

1213021957968 is a wasteful number, since it uses less digits than its factorization.

1213021957968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21766894 (or 21766879 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 54.

The spelling of 1213021957968 in words is "one trillion, two hundred thirteen billion, twenty-one million, nine hundred fifty-seven thousand, nine hundred sixty-eight".