21401132040 has 192 divisors, whose sum is σ = 75781353600. Its totient is φ = 5371186176.

The previous prime is 21401132029. The next prime is 21401132041. The reversal of 21401132040 is 4023110412.

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

It is not an unprimeable number, because it can be changed into a prime (21401132041) 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, 277837 + ... + 346403.

It is an arithmetic number, because the mean of its divisors is an integer number (394694550).

Almost surely, 2^21401132040 is an apocalyptic number.

21401132040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21401132040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37890676800).

21401132040 is an abundant number, since it is smaller than the sum of its proper divisors (54380221560).

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

21401132040 is a wasteful number, since it uses less digits than its factorization.

21401132040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68621 (or 68594 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21401132040 its reverse (4023110412), we get a palindrome (25424242452).

It can be divided in two parts, 214011 and 32040, that added together give a triangular number (246051 = T₇₀₁).

The spelling of 21401132040 in words is "twenty-one billion, four hundred one million, one hundred thirty-two thousand, forty".