1228617821970 has 384 divisors, whose sum is σ = 4053289144320. Its totient is φ = 250779456000.

The previous prime is 1228617821927. The next prime is 1228617821987. The reversal of 1228617821970 is 791287168221.

1228617821970 is a `hidden beast` number, since 1 + 2 + 2 + 8 + 617 + 8 + 2 + 19 + 7 + 0 = 666.

It is a super-2 number, since 2×1228617821970² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 435833221 + ... + 435836039.

It is an arithmetic number, because the mean of its divisors is an integer number (10555440480).

Almost surely, 2^{1228617821970} is an apocalyptic number.

1228617821970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1228617821970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2026644572160).

1228617821970 is an abundant number, since it is smaller than the sum of its proper divisors (2824671322350).

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

1228617821970 is a wasteful number, since it uses less digits than its factorization.

1228617821970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3942 (or 3939 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 54.

The spelling of 1228617821970 in words is "one trillion, two hundred twenty-eight billion, six hundred seventeen million, eight hundred twenty-one thousand, nine hundred seventy".