1235421520221 has 16 divisors (see below), whose sum is σ = 1882804105728. Its totient is φ = 705858769200.

The previous prime is 1235421520199. The next prime is 1235421520271. The reversal of 1235421520221 is 1220251245321.

It is not a de Polignac number, because 1235421520221 - 2¹³ = 1235421512029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1235421520271) 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, 3858435 + ... + 4166336.

It is an arithmetic number, because the mean of its divisors is an integer number (117675256608).

Almost surely, 2^{1235421520221} is an apocalyptic number.

It is an amenable number.

1235421520221 is a deficient number, since it is larger than the sum of its proper divisors (647382585507).

1235421520221 is an equidigital number, since it uses as much as digits as its factorization.

1235421520221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8032112.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 1235421520221 its reverse (1220251245321), we get a palindrome (2455672765542).

The spelling of 1235421520221 in words is "one trillion, two hundred thirty-five billion, four hundred twenty-one million, five hundred twenty thousand, two hundred twenty-one".