20021142501 has 12 divisors (see below), whose sum is σ = 28920654828. Its totient is φ = 13346862144.

The previous prime is 20021142347. The next prime is 20021142521. The reversal of 20021142501 is 10524112002.

20021142501 is a `hidden beast` number, since 2 + 0 + 0 + 21 + 142 + 501 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1507458276 + 18513684225 = 38826^2 + 136065^2 .

It is not a de Polignac number, because 20021142501 - 2⁹ = 20021141989 is a prime.

It is a super-2 number, since 2×20021142501² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021142521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 388801 + ... + 437273.

It is an arithmetic number, because the mean of its divisors is an integer number (2410054569).

Almost surely, 2^20021142501 is an apocalyptic number.

It is an amenable number.

20021142501 is a deficient number, since it is larger than the sum of its proper divisors (8899512327).

20021142501 is a wasteful number, since it uses less digits than its factorization.

20021142501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94372 (or 94369 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

Adding to 20021142501 its reverse (10524112002), we get a palindrome (30545254503).

The spelling of 20021142501 in words is "twenty billion, twenty-one million, one hundred forty-two thousand, five hundred one".