1021221001231 has 8 divisors (see below), whose sum is σ = 1121707278720. Its totient is φ = 925408504152.

The previous prime is 1021221001219. The next prime is 1021221001253. The reversal of 1021221001231 is 1321001221201.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021221001231 is a prime.

It is a super-2 number, since 2×1021221001231² (a number of 25 digits) 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 (1021221001291) 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, 1168444645 + ... + 1168445518.

It is an arithmetic number, because the mean of its divisors is an integer number (140213409840).

Almost surely, 2^{1021221001231} is an apocalyptic number.

1021221001231 is a deficient number, since it is larger than the sum of its proper divisors (100486277489).

1021221001231 is a wasteful number, since it uses less digits than its factorization.

1021221001231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2336890205.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 1021221001231 its reverse (1321001221201), we get a palindrome (2342222222432).

The spelling of 1021221001231 in words is "one trillion, twenty-one billion, two hundred twenty-one million, one thousand, two hundred thirty-one".