1021511545040 has 80 divisors (see below), whose sum is σ = 2715723825408. Its totient is φ = 350049082368.

The previous prime is 1021511545039. The next prime is 1021511545091. The reversal of 1021511545040 is 405451151201.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 1021511544994 and 1021511545012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 594509 + ... + 1548051.

Almost surely, 2^{1021511545040} is an apocalyptic number.

1021511545040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021511545040 is an abundant number, since it is smaller than the sum of its proper divisors (1694212280368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021511545040 is a wasteful number, since it uses less digits than its factorization.

1021511545040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955476 (or 955470 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 29.

Adding to 1021511545040 its reverse (405451151201), we get a palindrome (1426962696241).

The spelling of 1021511545040 in words is "one trillion, twenty-one billion, five hundred eleven million, five hundred forty-five thousand, forty".