1421155553440 has 144 divisors (see below), whose sum is σ = 3914465903712. Its totient is φ = 486152249856.

The previous prime is 1421155553417. The next prime is 1421155553459. The reversal of 1421155553440 is 443555511241.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 1421155553393 and 1421155553402.

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, 3268527 + ... + 3677713.

It is an arithmetic number, because the mean of its divisors is an integer number (27183790998).

Almost surely, 2^{1421155553440} is an apocalyptic number.

1421155553440 is a gapful number since it is divisible by the number (10) 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 1421155553440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1957232951856).

1421155553440 is an abundant number, since it is smaller than the sum of its proper divisors (2493310350272).

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

1421155553440 is a wasteful number, since it uses less digits than its factorization.

1421155553440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409659 (or 409644 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 40.

The spelling of 1421155553440 in words is "one trillion, four hundred twenty-one billion, one hundred fifty-five million, five hundred fifty-three thousand, four hundred forty".