1021211109978 has 8 divisors (see below), whose sum is σ = 2042422219968. Its totient is φ = 340403703324.

The previous prime is 1021211109959. The next prime is 1021211110019. The reversal of 1021211109978 is 8799011121201.

It is a sphenic number, since it is the product of 3 distinct primes.

1021211109978 is an admirable number.

It is a super-2 number, since 2×1021211109978² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85100925826 + ... + 85100925837.

It is an arithmetic number, because the mean of its divisors is an integer number (255302777496).

Almost surely, 2^{1021211109978} is an apocalyptic number.

1021211109978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1021211109978 is a wasteful number, since it uses less digits than its factorization.

1021211109978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170201851668.

The product of its (nonzero) digits is 18144, while the sum is 42.

The spelling of 1021211109978 in words is "one trillion, twenty-one billion, two hundred eleven million, one hundred nine thousand, nine hundred seventy-eight".