1021121131 has 4 divisors (see below), whose sum is σ = 1022630112. Its totient is φ = 1019612152.

The previous prime is 1021121063. The next prime is 1021121147. The reversal of 1021121131 is 1311211201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1021121131 - 2⁹ = 1021120619 is a prime.

It is a super-3 number, since 3×1021121131³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a zygodrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (1021121191) 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, 753475 + ... + 754828.

It is an arithmetic number, because the mean of its divisors is an integer number (255657528).

Almost surely, 2^1021121131 is an apocalyptic number.

1021121131 is a deficient number, since it is larger than the sum of its proper divisors (1508981).

1021121131 is an equidigital number, since it uses as much as digits as its factorization.

1021121131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1508980.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1021121131 is about 31954.9860115757. The cubic root of 1021121131 is about 1006.9913836431.

Adding to 1021121131 its reverse (1311211201), we get a palindrome (2332332332).

The spelling of 1021121131 in words is "one billion, twenty-one million, one hundred twenty-one thousand, one hundred thirty-one".