1021400321221 has 8 divisors (see below), whose sum is σ = 1186450959104. Its totient is φ = 861133759920.

The previous prime is 1021400321197. The next prime is 1021400321231. The reversal of 1021400321221 is 1221230041201.

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

It is not a de Polignac number, because 1021400321221 - 2⁹ = 1021400320709 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 (1021400321231) 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, 1196018685 + ... + 1196019538.

It is an arithmetic number, because the mean of its divisors is an integer number (148306369888).

Almost surely, 2^{1021400321221} is an apocalyptic number.

It is an amenable number.

1021400321221 is a deficient number, since it is larger than the sum of its proper divisors (165050637883).

1021400321221 is an equidigital number, since it uses as much as digits as its factorization.

1021400321221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2392038291.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 1021400321221 its reverse (1221230041201), we get a palindrome (2242630362422).

The spelling of 1021400321221 in words is "one trillion, twenty-one billion, four hundred million, three hundred twenty-one thousand, two hundred twenty-one".