1000021021121 has 4 divisors (see below), whose sum is σ = 1000023053232. Its totient is φ = 1000018989012.

The previous prime is 1000021021117. The next prime is 1000021021151. The reversal of 1000021021121 is 1211201200001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1000021021121 - 2² = 1000021021117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1000021021151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238250 + ... + 1434156.

It is an arithmetic number, because the mean of its divisors is an integer number (250005763308).

Almost surely, 2^{1000021021121} is an apocalyptic number.

It is an amenable number.

1000021021121 is a deficient number, since it is larger than the sum of its proper divisors (2032111).

1000021021121 is an equidigital number, since it uses as much as digits as its factorization.

1000021021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2032110.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1000021021121 its reverse (1211201200001), we get a palindrome (2211222221122).

The spelling of 1000021021121 in words is "one trillion, twenty-one million, twenty-one thousand, one hundred twenty-one".