21030141440 has 240 divisors, whose sum is σ = 63991890864. Its totient is φ = 6554419200.

The previous prime is 21030141427. The next prime is 21030141479. The reversal of 21030141440 is 4414103012.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1372220 + ... + 1387460.

Almost surely, 2^21030141440 is an apocalyptic number.

21030141440 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 21030141440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31995945432).

21030141440 is an abundant number, since it is smaller than the sum of its proper divisors (42961749424).

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

21030141440 is a wasteful number, since it uses less digits than its factorization.

21030141440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15289 (or 15266 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21030141440 its reverse (4414103012), we get a palindrome (25444244452).

The spelling of 21030141440 in words is "twenty-one billion, thirty million, one hundred forty-one thousand, four hundred forty".