21520212434530 has 64 divisors (see below), whose sum is σ = 41591312974080. Its totient is φ = 7987963336704.

The previous prime is 21520212434521. The next prime is 21520212434533. The reversal of 21520212434530 is 3543421202512.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (21520212434533) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35527341 + ... + 36127999.

It is an arithmetic number, because the mean of its divisors is an integer number (649864265220).

Almost surely, 2^{21520212434530} is an apocalyptic number.

21520212434530 is a deficient number, since it is larger than the sum of its proper divisors (20071100539550).

21520212434530 is a wasteful number, since it uses less digits than its factorization.

21520212434530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603643.

The product of its (nonzero) digits is 57600, while the sum is 34.

The spelling of 21520212434530 in words is "twenty-one trillion, five hundred twenty billion, two hundred twelve million, four hundred thirty-four thousand, five hundred thirty".