1011021110021 has 4 divisors (see below), whose sum is σ = 1088791964652. Its totient is φ = 933250255392.

The previous prime is 1011021109979. The next prime is 1011021110023. The reversal of 1011021110021 is 1200111201101.

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

It can be written as a sum of positive squares in 2 ways, for example, as 573108047521 + 437913062500 = 757039^2 + 661750^2 .

It is not a de Polignac number, because 1011021110021 - 2²² = 1011016915717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1011021109984 and 1011021110011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011021110023) 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, 38885427296 + ... + 38885427321.

It is an arithmetic number, because the mean of its divisors is an integer number (272197991163).

Almost surely, 2^{1011021110021} is an apocalyptic number.

It is an amenable number.

1011021110021 is a deficient number, since it is larger than the sum of its proper divisors (77770854631).

1011021110021 is an equidigital number, since it uses as much as digits as its factorization.

1011021110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77770854630.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 1011021110021 its reverse (1200111201101), we get a palindrome (2211132311122).

The spelling of 1011021110021 in words is "one trillion, eleven billion, twenty-one million, one hundred ten thousand, twenty-one".