20331521501 has 16 divisors (see below), whose sum is σ = 22787179200. Its totient is φ = 18027088128.

The previous prime is 20331521479. The next prime is 20331521513. The reversal of 20331521501 is 10512513302.

It is a happy number.

It is not a de Polignac number, because 20331521501 - 2¹⁸ = 20331259357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20331527501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118010 + ... + 233643.

It is an arithmetic number, because the mean of its divisors is an integer number (1424198700).

Almost surely, 2^20331521501 is an apocalyptic number.

It is an amenable number.

20331521501 is a deficient number, since it is larger than the sum of its proper divisors (2455657699).

20331521501 is a wasteful number, since it uses less digits than its factorization.

20331521501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351868.

The product of its (nonzero) digits is 900, while the sum is 23.

The spelling of 20331521501 in words is "twenty billion, three hundred thirty-one million, five hundred twenty-one thousand, five hundred one".