1282428021 has 16 divisors (see below), whose sum is σ = 1954747904. Its totient is φ = 732601584.

The previous prime is 1282428019. The next prime is 1282428023. The reversal of 1282428021 is 1208242821.

It is an interprime number because it is at equal distance from previous prime (1282428019) and next prime (1282428023).

It is not a de Polignac number, because 1282428021 - 2¹ = 1282428019 is a prime.

It is a super-4 number, since 4×1282428021⁴ (a number of 38 digits) contains 4444 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1282428021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1282428023) 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, 90030 + ... + 103296.

It is an arithmetic number, because the mean of its divisors is an integer number (122171744).

Almost surely, 2^1282428021 is an apocalyptic number.

It is an amenable number.

1282428021 is a deficient number, since it is larger than the sum of its proper divisors (672319883).

1282428021 is a wasteful number, since it uses less digits than its factorization.

1282428021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17880.

The product of its (nonzero) digits is 4096, while the sum is 30.

The square root of 1282428021 is about 35811.0041886569. The cubic root of 1282428021 is about 1086.4531403989.

The spelling of 1282428021 in words is "one billion, two hundred eighty-two million, four hundred twenty-eight thousand, twenty-one".