1021210221001 has 16 divisors (see below), whose sum is σ = 1046547710208. Its totient is φ = 995945932800.

The previous prime is 1021210220963. The next prime is 1021210221013. The reversal of 1021210221001 is 1001220121201.

It is a cyclic number.

It is not a de Polignac number, because 1021210221001 - 2⁹ = 1021210220489 is a prime.

It is a super-2 number, since 2×1021210221001² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021210221071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135417291 + ... + 135424831.

It is an arithmetic number, because the mean of its divisors is an integer number (65409231888).

Almost surely, 2^{1021210221001} is an apocalyptic number.

It is an amenable number.

1021210221001 is a deficient number, since it is larger than the sum of its proper divisors (25337489207).

1021210221001 is an equidigital number, since it uses as much as digits as its factorization.

1021210221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11952.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1021210221001 its reverse (1001220121201), we get a palindrome (2022430342202).

The spelling of 1021210221001 in words is "one trillion, twenty-one billion, two hundred ten million, two hundred twenty-one thousand, one".