1321213302421 has 16 divisors (see below), whose sum is σ = 1424937101184. Its totient is φ = 1221781264704.

The previous prime is 1321213302373. The next prime is 1321213302433. The reversal of 1321213302421 is 1242033121231.

It is not a de Polignac number, because 1321213302421 - 2⁹ = 1321213301909 is a prime.

It is a super-2 number, since 2×1321213302421² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321213305421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4810795 + ... + 5078008.

It is an arithmetic number, because the mean of its divisors is an integer number (89058568824).

Almost surely, 2^{1321213302421} is an apocalyptic number.

It is an amenable number.

1321213302421 is a deficient number, since it is larger than the sum of its proper divisors (103723798763).

1321213302421 is a wasteful number, since it uses less digits than its factorization.

1321213302421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9889020.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 1321213302421 its reverse (1242033121231), we get a palindrome (2563246423652).

The spelling of 1321213302421 in words is "one trillion, three hundred twenty-one billion, two hundred thirteen million, three hundred two thousand, four hundred twenty-one".