1021002022091 has 16 divisors (see below), whose sum is σ = 1070971440000. Its totient is φ = 972049268736.

The previous prime is 1021002022043. The next prime is 1021002022129. The reversal of 1021002022091 is 1902202001201.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1021002022091 - 2²⁶ = 1020934913227 is a prime.

It is a super-2 number, since 2×1021002022091² (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 (1021002022031) 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, 1472015 + ... + 2051543.

It is an arithmetic number, because the mean of its divisors is an integer number (66935715000).

Almost surely, 2^{1021002022091} is an apocalyptic number.

1021002022091 is a deficient number, since it is larger than the sum of its proper divisors (49969417909).

1021002022091 is an equidigital number, since it uses as much as digits as its factorization.

1021002022091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580406.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1021002022091 its reverse (1902202001201), we get a palindrome (2923204023292).

The spelling of 1021002022091 in words is "one trillion, twenty-one billion, two million, twenty-two thousand, ninety-one".