1021420420 has 24 divisors (see below), whose sum is σ = 2146894848. Its totient is φ = 408204000.

The previous prime is 1021420369. The next prime is 1021420423. The reversal of 1021420420 is 240241201.

It is a junction number, because it is equal to n+sod(n) for n = 1021420394 and 1021420403.

It is not an unprimeable number, because it can be changed into a prime (1021420423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 835 + ... + 45205.

It is an arithmetic number, because the mean of its divisors is an integer number (89453952).

Almost surely, 2^1021420420 is an apocalyptic number.

1021420420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021420420 is an abundant number, since it is smaller than the sum of its proper divisors (1125474428).

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

1021420420 is a wasteful number, since it uses less digits than its factorization.

1021420420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45531 (or 45529 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1021420420 is about 31959.6686465927. The cubic root of 1021420420 is about 1007.0897565638.

Adding to 1021420420 its reverse (240241201), we get a palindrome (1261661621).

The spelling of 1021420420 in words is "one billion, twenty-one million, four hundred twenty thousand, four hundred twenty".