21420121420341 has 320 divisors, whose sum is σ = 40251530880000. Its totient is φ = 11304890634240.

The previous prime is 21420121420337. The next prime is 21420121420349. The reversal of 21420121420341 is 14302412102412.

21420121420341 is a `hidden beast` number, since 2 + 1 + 4 + 201 + 2 + 1 + 420 + 34 + 1 = 666.

It is not a de Polignac number, because 21420121420341 - 2² = 21420121420337 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420121420349) by changing a digit.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 23308075080 + ... + 23308075998.

It is an arithmetic number, because the mean of its divisors is an integer number (125786034000).

Almost surely, 2^{21420121420341} is an apocalyptic number.

21420121420341 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21420121420341 is a deficient number, since it is larger than the sum of its proper divisors (18831409459659).

21420121420341 is an equidigital number, since it uses as much as digits as its factorization.

21420121420341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1839 (or 1816 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

Adding to 21420121420341 its reverse (14302412102412), we get a palindrome (35722533522753).

The spelling of 21420121420341 in words is "twenty-one trillion, four hundred twenty billion, one hundred twenty-one million, four hundred twenty thousand, three hundred forty-one".