1021041520400 has 60 divisors (see below), whose sum is σ = 2676057014544. Its totient is φ = 371287824000.

The previous prime is 1021041520393. The next prime is 1021041520417. The reversal of 1021041520400 is 40251401201.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 116023046 + ... + 116031845.

Almost surely, 2^{1021041520400} is an apocalyptic number.

1021041520400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021041520400 is an abundant number, since it is smaller than the sum of its proper divisors (1655015494144).

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

1021041520400 is a wasteful number, since it uses less digits than its factorization.

1021041520400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232054920 (or 232054909 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 1021041520400 its reverse (40251401201), we get a palindrome (1061292921601).

The spelling of 1021041520400 in words is "one trillion, twenty-one billion, forty-one million, five hundred twenty thousand, four hundred".