1021131420 has 24 divisors (see below), whose sum is σ = 2859168144. Its totient is φ = 272301696.

The previous prime is 1021131409. The next prime is 1021131431. The reversal of 1021131420 is 241311201.

It is an interprime number because it is at equal distance from previous prime (1021131409) and next prime (1021131431).

It is a super-2 number, since 2×1021131420² = 2085418753822432800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1021131420.

It is a congruent number.

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, 8509369 + ... + 8509488.

It is an arithmetic number, because the mean of its divisors is an integer number (119132006).

Almost surely, 2^1021131420 is an apocalyptic number.

1021131420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021131420 is an abundant number, since it is smaller than the sum of its proper divisors (1838036724).

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

1021131420 is a wasteful number, since it uses less digits than its factorization.

1021131420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17018869 (or 17018867 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1021131420 is about 31955.1470032607. The cubic root of 1021131420 is about 1006.9947658405.

Adding to 1021131420 its reverse (241311201), we get a palindrome (1262442621).

The spelling of 1021131420 in words is "one billion, twenty-one million, one hundred thirty-one thousand, four hundred twenty".