1021121213 has 8 divisors (see below), whose sum is σ = 1168423680. Its totient is φ = 874175760.

The previous prime is 1021121209. The next prime is 1021121243. The reversal of 1021121213 is 3121211201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1021121213 - 2² = 1021121209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021121203) 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, 83093 + ... + 94586.

It is an arithmetic number, because the mean of its divisors is an integer number (146052960).

Almost surely, 2^1021121213 is an apocalyptic number.

It is an amenable number.

1021121213 is a deficient number, since it is larger than the sum of its proper divisors (147302467).

1021121213 is an equidigital number, since it uses as much as digits as its factorization.

1021121213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178507.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1021121213 is about 31954.9872946306. The cubic root of 1021121213 is about 1006.9914105982.

Adding to 1021121213 its reverse (3121211201), we get a palindrome (4142332414).

The spelling of 1021121213 in words is "one billion, twenty-one million, one hundred twenty-one thousand, two hundred thirteen".