1021111311545 has 8 divisors (see below), whose sum is σ = 1319590002696. Its totient is φ = 754051430016.

The previous prime is 1021111311529. The next prime is 1021111311553. The reversal of 1021111311545 is 5451131111201.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 46395436816 + 974715874729 = 215396^2 + 987277^2 .

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 1021111311545 - 2⁴ = 1021111311529 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7854702332 + ... + 7854702461.

It is an arithmetic number, because the mean of its divisors is an integer number (164948750337).

Almost surely, 2^{1021111311545} is an apocalyptic number.

It is an amenable number.

1021111311545 is a deficient number, since it is larger than the sum of its proper divisors (298478691151).

1021111311545 is a wasteful number, since it uses less digits than its factorization.

1021111311545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15709404811.

The product of its (nonzero) digits is 600, while the sum is 26.

Adding to 1021111311545 its reverse (5451131111201), we get a palindrome (6472242422746).

The spelling of 1021111311545 in words is "one trillion, twenty-one billion, one hundred eleven million, three hundred eleven thousand, five hundred forty-five".