1321210030021 has 8 divisors (see below), whose sum is σ = 1510628725760. Its totient is φ = 1131959935728.

The previous prime is 1321210029989. The next prime is 1321210030043. The reversal of 1321210030021 is 1200300121231.

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 1321210030021 - 2⁵ = 1321210029989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1321210029977 and 1321210030004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321210030061) 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, 42133566 + ... + 42164911.

It is an arithmetic number, because the mean of its divisors is an integer number (188828590720).

Almost surely, 2^{1321210030021} is an apocalyptic number.

It is an amenable number.

1321210030021 is a deficient number, since it is larger than the sum of its proper divisors (189418695739).

1321210030021 is an equidigital number, since it uses as much as digits as its factorization.

1321210030021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84300723.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 1321210030021 its reverse (1200300121231), we get a palindrome (2521510151252).

The spelling of 1321210030021 in words is "one trillion, three hundred twenty-one billion, two hundred ten million, thirty thousand, twenty-one".