21035521455213 has 8 divisors (see below), whose sum is σ = 28047543048000. Its totient is φ = 14023590416288.

The previous prime is 21035521455199. The next prime is 21035521455317. The reversal of 21035521455213 is 31255412553012.

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

It is a cyclic number.

It is not a de Polignac number, because 21035521455213 - 2⁸ = 21035521454957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21035521453213) 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, 22094568 + ... + 23026961.

It is an arithmetic number, because the mean of its divisors is an integer number (3505942881000).

Almost surely, 2^{21035521455213} is an apocalyptic number.

It is an amenable number.

21035521455213 is a deficient number, since it is larger than the sum of its proper divisors (7012021592787).

21035521455213 is a wasteful number, since it uses less digits than its factorization.

21035521455213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45276931.

The product of its (nonzero) digits is 180000, while the sum is 39.

The spelling of 21035521455213 in words is "twenty-one trillion, thirty-five billion, five hundred twenty-one million, four hundred fifty-five thousand, two hundred thirteen".