20211521430 has 32 divisors (see below), whose sum is σ = 48589494624. Its totient is φ = 5380645376.

The previous prime is 20211521401. The next prime is 20211521441. The reversal of 20211521430 is 3412511202.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20211521397 and 20211521406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 550269 + ... + 585848.

It is an arithmetic number, because the mean of its divisors is an integer number (1518421707).

Almost surely, 2^20211521430 is an apocalyptic number.

20211521430 is an abundant number, since it is smaller than the sum of its proper divisors (28377973194).

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

20211521430 is a wasteful number, since it uses less digits than its factorization.

20211521430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136720.

The product of its (nonzero) digits is 480, while the sum is 21.

The spelling of 20211521430 in words is "twenty billion, two hundred eleven million, five hundred twenty-one thousand, four hundred thirty".