1001212221021 has 8 divisors (see below), whose sum is σ = 1335626244960. Its totient is φ = 667136505552.

The previous prime is 1001212221017. The next prime is 1001212221043. The reversal of 1001212221021 is 1201222121001.

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

It is not a de Polignac number, because 1001212221021 - 2² = 1001212221017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001212221011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84570211 + ... + 84582048.

It is an arithmetic number, because the mean of its divisors is an integer number (166953280620).

Almost surely, 2^{1001212221021} is an apocalyptic number.

It is an amenable number.

1001212221021 is a deficient number, since it is larger than the sum of its proper divisors (334414023939).

1001212221021 is a wasteful number, since it uses less digits than its factorization.

1001212221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169154235.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1001212221021 its reverse (1201222121001), we get a palindrome (2202434342022).

The spelling of 1001212221021 in words is "one trillion, one billion, two hundred twelve million, two hundred twenty-one thousand, twenty-one".