1021220131 has 4 divisors (see below), whose sum is σ = 1033524072. Its totient is φ = 1008916192.

The previous prime is 1021220129. The next prime is 1021220143. The reversal of 1021220131 is 1310221201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1310221201 = 59 ⋅22207139.

It is a cyclic number.

It is not a de Polignac number, because 1021220131 - 2¹ = 1021220129 is a prime.

It is a super-2 number, since 2×1021220131² = 2085781111919314322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021226131) 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 3 ways as a sum of consecutive naturals, for example, 6151846 + ... + 6152011.

It is an arithmetic number, because the mean of its divisors is an integer number (258381018).

Almost surely, 2^1021220131 is an apocalyptic number.

1021220131 is a deficient number, since it is larger than the sum of its proper divisors (12303941).

1021220131 is an equidigital number, since it uses as much as digits as its factorization.

1021220131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12303940.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1021220131 is about 31956.5350280659. The cubic root of 1021220131 is about 1007.0239259545.

Adding to 1021220131 its reverse (1310221201), we get a palindrome (2331441332).

The spelling of 1021220131 in words is "one billion, twenty-one million, two hundred twenty thousand, one hundred thirty-one".