2021401404 has 144 divisors (see below), whose sum is σ = 5676652800. Its totient is φ = 601413120.

The previous prime is 2021401399. The next prime is 2021401409. The reversal of 2021401404 is 4041041202.

It is an interprime number because it is at equal distance from previous prime (2021401399) and next prime (2021401409).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021401409) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8904739 + ... + 8904965.

It is an arithmetic number, because the mean of its divisors is an integer number (39421200).

Almost surely, 2^2021401404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2021401404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2838326400).

2021401404 is an abundant number, since it is smaller than the sum of its proper divisors (3655251396).

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

2021401404 is a wasteful number, since it uses less digits than its factorization.

2021401404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560 (or 555 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 2021401404 is about 44959.9978202846. The cubic root of 2021401404 is about 1264.3991280483.

Adding to 2021401404 its reverse (4041041202), we get a palindrome (6062442606).

The spelling of 2021401404 in words is "two billion, twenty-one million, four hundred one thousand, four hundred four".