1221958164492 has 192 divisors, whose sum is σ = 3462576768000. Its totient is φ = 370409780736.

The previous prime is 1221958164463. The next prime is 1221958164503. The reversal of 1221958164492 is 2944618591221.

1221958164492 is a `hidden beast` number, since 1 + 2 + 2 + 1 + 95 + 8 + 1 + 64 + 492 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 41820384 + ... + 41849592.

It is an arithmetic number, because the mean of its divisors is an integer number (18034254000).

Almost surely, 2^{1221958164492} is an apocalyptic number.

1221958164492 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221958164492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1731288384000).

1221958164492 is an abundant number, since it is smaller than the sum of its proper divisors (2240618603508).

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

1221958164492 is a wasteful number, since it uses less digits than its factorization.

1221958164492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29677 (or 29669 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 54.

The spelling of 1221958164492 in words is "one trillion, two hundred twenty-one billion, nine hundred fifty-eight million, one hundred sixty-four thousand, four hundred ninety-two".