1021052105420 has 24 divisors (see below), whose sum is σ = 2163184730784. Its totient is φ = 404806497536.

The previous prime is 1021052105389. The next prime is 1021052105453. The reversal of 1021052105420 is 245012501201.

It is a super-2 number, since 2×1021052105420² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225894224 + ... + 225898743.

It is an arithmetic number, because the mean of its divisors is an integer number (90132697116).

Almost surely, 2^{1021052105420} is an apocalyptic number.

1021052105420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021052105420 is an abundant number, since it is smaller than the sum of its proper divisors (1142132625364).

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

1021052105420 is a wasteful number, since it uses less digits than its factorization.

1021052105420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451793089 (or 451793087 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

Adding to 1021052105420 its reverse (245012501201), we get a palindrome (1266064606621).

The spelling of 1021052105420 in words is "one trillion, twenty-one billion, fifty-two million, one hundred five thousand, four hundred twenty".