1011312210021 has 12 divisors (see below), whose sum is σ = 1385844933312. Its totient is φ = 655986295728.

The previous prime is 1011312209917. The next prime is 1011312210023. The reversal of 1011312210021 is 1200122131101.

It is not a de Polignac number, because 1011312210021 - 2⁷ = 1011312209893 is a prime.

It is a super-2 number, since 2×1011312210021² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011312210023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 123116445 + ... + 123124658.

It is an arithmetic number, because the mean of its divisors is an integer number (115487077776).

Almost surely, 2^{1011312210021} is an apocalyptic number.

It is an amenable number.

1011312210021 is a deficient number, since it is larger than the sum of its proper divisors (374532723291).

1011312210021 is an equidigital number, since it uses as much as digits as its factorization.

1011312210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246241180 (or 246241143 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 1011312210021 its reverse (1200122131101), we get a palindrome (2211434341122).

The spelling of 1011312210021 in words is "one trillion, eleven billion, three hundred twelve million, two hundred ten thousand, twenty-one".