1021211101091 has 8 divisors (see below), whose sum is σ = 1078415520000. Its totient is φ = 964352328840.

The previous prime is 1021211101061. The next prime is 1021211101103. The reversal of 1021211101091 is 1901011121201.

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

It is a cyclic number.

It is not a de Polignac number, because 1021211101091 - 2³⁸ = 746333194147 is a prime.

It is a super-2 number, since 2×1021211101091² (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 (1021211101021) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 86405591 + ... + 86417408.

It is an arithmetic number, because the mean of its divisors is an integer number (134801940000).

Almost surely, 2^{1021211101091} is an apocalyptic number.

1021211101091 is a deficient number, since it is larger than the sum of its proper divisors (57204418909).

1021211101091 is a wasteful number, since it uses less digits than its factorization.

1021211101091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172823329.

The product of its (nonzero) digits is 36, while the sum is 20.

Adding to 1021211101091 its reverse (1901011121201), we get a palindrome (2922222222292).

The spelling of 1021211101091 in words is "one trillion, twenty-one billion, two hundred eleven million, one hundred one thousand, ninety-one".