1021122205511 has 4 divisors (see below), whose sum is σ = 1036362835512. Its totient is φ = 1005881575512.

The previous prime is 1021122205451. The next prime is 1021122205517. The reversal of 1021122205511 is 1155022211201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021122205511 is a prime.

It is a super-2 number, since 2×1021122205511² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021122205517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7620314900 + ... + 7620315033.

It is an arithmetic number, because the mean of its divisors is an integer number (259090708878).

Almost surely, 2^{1021122205511} is an apocalyptic number.

1021122205511 is a deficient number, since it is larger than the sum of its proper divisors (15240630001).

1021122205511 is an equidigital number, since it uses as much as digits as its factorization.

1021122205511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15240630000.

The product of its (nonzero) digits is 400, while the sum is 23.

Adding to 1021122205511 its reverse (1155022211201), we get a palindrome (2176144416712).

The spelling of 1021122205511 in words is "one trillion, twenty-one billion, one hundred twenty-two million, two hundred five thousand, five hundred eleven".