421001420340021 has 8 divisors (see below), whose sum is σ = 561607323699840. Its totient is φ = 280531565270112.

The previous prime is 421001420339939. The next prime is 421001420340091. The reversal of 421001420340021 is 120043024100124.

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

It is not a de Polignac number, because 421001420340021 - 2¹⁰ = 421001420338997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421001420339973 and 421001420340000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421001420340091) 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, 34012065256 + ... + 34012077633.

It is an arithmetic number, because the mean of its divisors is an integer number (70200915462480).

Almost surely, 2^{421001420340021} is an apocalyptic number.

It is an amenable number.

421001420340021 is a deficient number, since it is larger than the sum of its proper divisors (140605903359819).

421001420340021 is a wasteful number, since it uses less digits than its factorization.

421001420340021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68024144955.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 421001420340021 its reverse (120043024100124), we get a palindrome (541044444440145).

The spelling of 421001420340021 in words is "four hundred twenty-one trillion, one billion, four hundred twenty million, three hundred forty thousand, twenty-one".