21213554610245 has 32 divisors (see below), whose sum is σ = 27039041568000. Its totient is φ = 15942627864064.

The previous prime is 21213554610091. The next prime is 21213554610323. The reversal of 21213554610245 is 54201645531212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21213554610245 - 2¹² = 21213554606149 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5627219 + ... + 8607711.

It is an arithmetic number, because the mean of its divisors is an integer number (844970049000).

Almost surely, 2^{21213554610245} is an apocalyptic number.

It is an amenable number.

21213554610245 is a deficient number, since it is larger than the sum of its proper divisors (5825486957755).

21213554610245 is a wasteful number, since it uses less digits than its factorization.

21213554610245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2981629.

The product of its (nonzero) digits is 288000, while the sum is 41.

The spelling of 21213554610245 in words is "twenty-one trillion, two hundred thirteen billion, five hundred fifty-four million, six hundred ten thousand, two hundred forty-five".