21213601103520 has 240 divisors, whose sum is σ = 85561524816768. Its totient is φ = 4848823088640.

The previous prime is 21213601103507. The next prime is 21213601103533. The reversal of 21213601103520 is 2530110631212.

21213601103520 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 3 + 601 + 1 + 0 + 3 + 52 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (21213601103507) and next prime (21213601103533).

It is a tau number, because it is divible by the number of its divisors (240).

It is a super-3 number, since 3×21213601103520³ (a number of 41 digits) contains 333 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 116827276 + ... + 117008715.

Almost surely, 2^{21213601103520} is an apocalyptic number.

21213601103520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21213601103520 is an abundant number, since it is smaller than the sum of its proper divisors (64347923713248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21213601103520 is a wasteful number, since it uses less digits than its factorization.

21213601103520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233836025 (or 233836008 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

Adding to 21213601103520 its reverse (2530110631212), we get a palindrome (23743711734732).

The spelling of 21213601103520 in words is "twenty-one trillion, two hundred thirteen billion, six hundred one million, one hundred three thousand, five hundred twenty".