1021400115555 has 16 divisors (see below), whose sum is σ = 1634790690720. Its totient is φ = 544563226368.

The previous prime is 1021400115551. The next prime is 1021400115601. The reversal of 1021400115555 is 5555110041201.

1021400115555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1021400115555 - 2² = 1021400115551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1021400115551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11422852 + ... + 11511921.

It is an arithmetic number, because the mean of its divisors is an integer number (102174418170).

Almost surely, 2^{1021400115555} is an apocalyptic number.

1021400115555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1021400115555 is a deficient number, since it is larger than the sum of its proper divisors (613390575165).

1021400115555 is a wasteful number, since it uses less digits than its factorization.

1021400115555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22937750.

The product of its (nonzero) digits is 5000, while the sum is 30.

Adding to 1021400115555 its reverse (5555110041201), we get a palindrome (6576510156756).

The spelling of 1021400115555 in words is "one trillion, twenty-one billion, four hundred million, one hundred fifteen thousand, five hundred fifty-five".