4015121022540 has 72 divisors (see below), whose sum is σ = 12630281947920. Its totient is φ = 1070698938048.

The previous prime is 4015121022529. The next prime is 4015121022551. The reversal of 4015121022540 is 452201215104.

It is a happy number.

4015121022540 is a `hidden beast` number, since 4 + 0 + 1 + 5 + 12 + 102 + 2 + 540 = 666.

It is an interprime number because it is at equal distance from previous prime (4015121022529) and next prime (4015121022551).

It is a super-2 number, since 2×4015121022540² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 413073435 + ... + 413083154.

It is an arithmetic number, because the mean of its divisors is an integer number (175420582610).

Almost surely, 2^{4015121022540} is an apocalyptic number.

It is an amenable number.

4015121022540 is an abundant number, since it is smaller than the sum of its proper divisors (8615160925380).

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

4015121022540 is a wasteful number, since it uses less digits than its factorization.

4015121022540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826156613 (or 826156599 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

Adding to 4015121022540 its reverse (452201215104), we get a palindrome (4467322237644).

The spelling of 4015121022540 in words is "four trillion, fifteen billion, one hundred twenty-one million, twenty-two thousand, five hundred forty".