2021238615440 has 80 divisors (see below), whose sum is σ = 5396417017920. Its totient is φ = 696311861760.

The previous prime is 2021238615373. The next prime is 2021238615457. The reversal of 2021238615440 is 445168321202.

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

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 2021238615394 and 2021238615403.

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, 60427019 + ... + 60460458.

It is an arithmetic number, because the mean of its divisors is an integer number (67455212724).

Almost surely, 2^{2021238615440} is an apocalyptic number.

2021238615440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021238615440 is an abundant number, since it is smaller than the sum of its proper divisors (3375178402480).

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

2021238615440 is a wasteful number, since it uses less digits than its factorization.

2021238615440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120887520 (or 120887514 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 38.

The spelling of 2021238615440 in words is "two trillion, twenty-one billion, two hundred thirty-eight million, six hundred fifteen thousand, four hundred forty".