10121515101440 has 72 divisors (see below), whose sum is σ = 24261185642400. Its totient is φ = 4045768165376.

The previous prime is 10121515101427. The next prime is 10121515101449. The reversal of 10121515101440 is 4410151512101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121515101449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 944090 + ... + 4597209.

It is an arithmetic number, because the mean of its divisors is an integer number (336960911700).

Almost surely, 2^{10121515101440} is an apocalyptic number.

10121515101440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10121515101440 is an abundant number, since it is smaller than the sum of its proper divisors (14139670540960).

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

10121515101440 is an equidigital number, since it uses as much as digits as its factorization.

10121515101440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5542747 (or 5542733 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 26.

Adding to 10121515101440 its reverse (4410151512101), we get a palindrome (14531666613541).

The spelling of 10121515101440 in words is "ten trillion, one hundred twenty-one billion, five hundred fifteen million, one hundred one thousand, four hundred forty".