1020155021405 has 24 divisors (see below), whose sum is σ = 1326185112672. Its totient is φ = 753011523264.

The previous prime is 1020155021363. The next prime is 1020155021423. The reversal of 1020155021405 is 5041205510201.

It is not a de Polignac number, because 1020155021405 - 2¹² = 1020155017309 is a prime.

It is a Duffinian number.

It is a Curzon number.

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, 1649342 + ... + 2181888.

It is an arithmetic number, because the mean of its divisors is an integer number (55257713028).

Almost surely, 2^{1020155021405} is an apocalyptic number.

It is an amenable number.

1020155021405 is a deficient number, since it is larger than the sum of its proper divisors (306030091267).

1020155021405 is a wasteful number, since it uses less digits than its factorization.

1020155021405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534845 (or 534832 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 26.

The spelling of 1020155021405 in words is "one trillion, twenty billion, one hundred fifty-five million, twenty-one thousand, four hundred five".