20403421221231 has 10 divisors (see below), whose sum is σ = 30479184787392. Its totient is φ = 13602280814100.

The previous prime is 20403421221167. The next prime is 20403421221233. The reversal of 20403421221231 is 13212212430402.

20403421221231 is a `hidden beast` number, since 2 + 0 + 4 + 0 + 3 + 421 + 2 + 2 + 1 + 231 = 666.

It is not a de Polignac number, because 20403421221231 - 2⁶ = 20403421221167 is a prime.

It is a super-2 number, since 2×20403421221231² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20403421221195 and 20403421221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20403421221233) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 125947044495 + ... + 125947044656.

Almost surely, 2^{20403421221231} is an apocalyptic number.

20403421221231 is a deficient number, since it is larger than the sum of its proper divisors (10075763566161).

20403421221231 is an equidigital number, since it uses as much as digits as its factorization.

20403421221231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251894089163 (or 251894089154 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 20403421221231 its reverse (13212212430402), we get a palindrome (33615633651633).

The spelling of 20403421221231 in words is "twenty trillion, four hundred three billion, four hundred twenty-one million, two hundred twenty-one thousand, two hundred thirty-one".