21022020131 has 6 divisors (see below), whose sum is σ = 24454186740. Its totient is φ = 18018874356.

The previous prime is 21022020121. The next prime is 21022020139. The reversal of 21022020131 is 13102022012.

It is a happy number.

It is not a de Polignac number, because 21022020131 - 2¹⁸ = 21021757987 is a prime.

It is a super-2 number, since 2×21022020131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21022020139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214510361 + ... + 214510458.

It is an arithmetic number, because the mean of its divisors is an integer number (4075697790).

Almost surely, 2^21022020131 is an apocalyptic number.

21022020131 is a deficient number, since it is larger than the sum of its proper divisors (3432166609).

21022020131 is an equidigital number, since it uses as much as digits as its factorization.

21022020131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429020833 (or 429020826 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21022020131 its reverse (13102022012), we get a palindrome (34124042143).

The spelling of 21022020131 in words is "twenty-one billion, twenty-two million, twenty thousand, one hundred thirty-one".