1020021431 has 16 divisors (see below), whose sum is σ = 1199280768. Its totient is φ = 855295200.

The previous prime is 1020021419. The next prime is 1020021451. The reversal of 1020021431 is 1341200201.

It is a cyclic number.

It is not a de Polignac number, because 1020021431 - 2¹⁸ = 1019759287 is a prime.

It is a super-2 number, since 2×1020021431² = 2080887439398575522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020021451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 285800 + ... + 289346.

It is an arithmetic number, because the mean of its divisors is an integer number (74955048).

Almost surely, 2^1020021431 is an apocalyptic number.

1020021431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1020021431 is a deficient number, since it is larger than the sum of its proper divisors (179259337).

1020021431 is a wasteful number, since it uses less digits than its factorization.

1020021431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5582.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1020021431 is about 31937.7743588998. The cubic root of 1020021431 is about 1006.6297594883.

Adding to 1020021431 its reverse (1341200201), we get a palindrome (2361221632).

The spelling of 1020021431 in words is "one billion, twenty million, twenty-one thousand, four hundred thirty-one".