1020001221019 has 32 divisors (see below), whose sum is σ = 1136223728640. Its totient is φ = 907904774400.

The previous prime is 1020001220999. The next prime is 1020001221023. The reversal of 1020001221019 is 9101221000201.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1020001221019 - 2¹³ = 1020001212827 is a prime.

It is a super-2 number, since 2×1020001221019² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1020001220987 and 1020001221005.

It is not an unprimeable number, because it can be changed into a prime (1020001221049) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 129882897 + ... + 129890749.

It is an arithmetic number, because the mean of its divisors is an integer number (35506991520).

Almost surely, 2^{1020001221019} is an apocalyptic number.

1020001221019 is a deficient number, since it is larger than the sum of its proper divisors (116222507621).

1020001221019 is a wasteful number, since it uses less digits than its factorization.

1020001221019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9171.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 1020001221019 in words is "one trillion, twenty billion, one million, two hundred twenty-one thousand, nineteen".