21402115602351 has 16 divisors (see below), whose sum is σ = 31133823603840. Its totient is φ = 12969531804320.

The previous prime is 21402115602341. The next prime is 21402115602367. The reversal of 21402115602351 is 15320651120412.

It is a cyclic number.

It is not a de Polignac number, because 21402115602351 - 2⁷ = 21402115602223 is a prime.

It is a super-3 number, since 3×21402115602351³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21402115602341) 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, 35883456 + ... + 36475013.

It is an arithmetic number, because the mean of its divisors is an integer number (1945863975240).

Almost surely, 2^{21402115602351} is an apocalyptic number.

21402115602351 is a deficient number, since it is larger than the sum of its proper divisors (9731708001489).

21402115602351 is a wasteful number, since it uses less digits than its factorization.

21402115602351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72367446.

The product of its (nonzero) digits is 14400, while the sum is 33.

Adding to 21402115602351 its reverse (15320651120412), we get a palindrome (36722766722763).

The spelling of 21402115602351 in words is "twenty-one trillion, four hundred two billion, one hundred fifteen million, six hundred two thousand, three hundred fifty-one".